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Head down (wav version)
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Sur d’autres sites (3432)
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Invalid NAL unit size for MP4 created from NALU with 3-byte start code (0x000001)
9 septembre 2020, par rscI have a mp4 muxer that works fine when the H264 NALU has the 4-byte start code (0x00000001). I am adapting it to support 3-byte start code (0x000001) but I am stuck with a bug that I am not able to identify. The MP4 generated open in VLC and MediaPlayer but no video is displayed. In VLC statistics shows that it is decoding blocks but stays with 0 frames displayed.


I then ran a error analyzer using ffmpeg (ffmpeg -v error -i myvideo.mp4 -f null - 2>error.log that shows me the following output :


[h264 @ 0x7fa3b5003200] Invalid NAL unit size (158559 > 158558).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9338 > 9337).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (6582 > 6581).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (8300 > 8299).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9336 > 9335).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9422 > 9421).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (10448 > 10447).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9208 > 9207).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (8776 > 8775).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (11376 > 11375).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (158311 > 158310).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9164 > 9163).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (7994 > 7993).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9974 > 9973).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9282 > 9281).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.
[h264 @ 0x7fa3b5003200] Invalid NAL unit size (9656 > 9655).
[h264 @ 0x7fa3b5003200] Error splitting the input into NAL units.


I am trying to find why it is complaining about 1 byte difference in all mdat boxes. Also, the smaller values (e.g : 158558) are 12 bytes lower than the size written inside the mdat header.


Anyone could help indicate why that error is happening ? The same code is working fine to create MP4 with 4-byte NALU start code.


UPDATE : I ran ffprobe and it provides a few more details, more specifically saying that couldn't find the "codec parameters" :


$ ffprobe -analyzeduration 2147483647 -probesize 2147483647 -i myvideo.mp4 
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
 built with Apple clang version 11.0.3 (clang-1103.0.32.62)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147087 > 147086).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8104 > 8103).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9752 > 9751).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12058 > 12057).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9026 > 9025).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12032 > 12031).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12566 > 12565).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7906 > 7905).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9758 > 9757).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12840 > 12839).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (146771 > 146770).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7708 > 7707).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9524 > 9523).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12230 > 12229).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9080 > 9079).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12164 > 12163).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12650 > 12649).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7916 > 7915).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9736 > 9735).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (13086 > 13085).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147143 > 147142).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8218 > 8217).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9908 > 9907).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12450 > 12449).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7806 > 7805).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9598 > 9597).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12692 > 12691).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9782 > 9781).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12930 > 12929).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12750 > 12749).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (146911 > 146910).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8182 > 8181).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9494 > 9493).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12268 > 12267).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8898 > 8897).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11946 > 11945).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12622 > 12621).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8108 > 8107).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9754 > 9753).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12110 > 12109).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147067 > 147066).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7726 > 7725).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9424 > 9423).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12078 > 12077).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8976 > 8975).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11686 > 11685).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11940 > 11939).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9274 > 9273).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11950 > 11949).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11702 > 11701).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147021 > 147020).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7686 > 7685).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9572 > 9571).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11810 > 11809).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11584 > 11583).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9116 > 9115).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11986 > 11985).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11390 > 11389).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9008 > 9007).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11768 > 11767).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147347 > 147346).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7618 > 7617).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9266 > 9265).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12046 > 12045).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11562 > 11561).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8898 > 8897).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11672 > 11671).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11458 > 11457).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8850 > 8849).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11452 > 11451).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147213 > 147212).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7540 > 7539).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9610 > 9609).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12302 > 12301).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9154 > 9153).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11868 > 11867).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12054 > 12053).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7508 > 7507).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9136 > 9135).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11812 > 11811).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147089 > 147088).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7800 > 7799).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9482 > 9481).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12244 > 12243).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9198 > 9197).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11962 > 11961).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12386 > 12385).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7618 > 7617).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (8996 > 8995).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11800 > 11799).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147135 > 147134).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7934 > 7933).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9742 > 9741).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12398 > 12397).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7540 > 7539).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9130 > 9129).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12482 > 12481).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12002 > 12001).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11710 > 11709).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11886 > 11885).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147303 > 147302).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7620 > 7619).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9316 > 9315).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12138 > 12137).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9056 > 9055).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11968 > 11967).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11942 > 11941).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9072 > 9071).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11546 > 11545).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (11368 > 11367).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (147363 > 147362).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (7578 > 7577).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9466 > 9465).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (12230 > 12229).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[h264 @ 0x7fa85f800e00] Invalid NAL unit size (9248 > 9247).
[h264 @ 0x7fa85f800e00] Error splitting the input into NAL units.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa85f000000] decoding for stream 0 failed
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa85f000000] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1280x960, 1717 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'myvideo.mp4':
 Metadata:
 major_brand : iso5
 minor_version : 512
 compatible_brands: iso6mp41
 Duration: 00:00:13.22, start: 0.000000, bitrate: 1726 kb/s
 Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none, 1280x960, 1717 kb/s, 8.70 fps, 9.25 tbr, 90k tbn, 180k tbc (default)
 Metadata:
 handler_name : VideoHandle


-
FFMPEG API Mp4 H264 Encoding/Muxing - unspecified pixel format
28 juillet 2020, par FabriceI'm working on a c++ project using ffmpeg. I have to generate an mp4 file with h264 encoding.


My problem is that the file generate but when reading the file with VLC I've got no image, and analyzing it with ffprobe give me (log below) the error :




unspecified pixel format




ffprobe version N-93020-g3224d6691c Copyright (c) 2007-2019 the FFmpeg developers
 built with gcc 8.2.1 (GCC) 20181201
 configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 libavutil 56. 26.100 / 56. 26.100
 libavcodec 58. 44.100 / 58. 44.100
 libavformat 58. 26.100 / 58. 26.100
 libavdevice 58. 6.101 / 58. 6.101
 libavfilter 7. 48.100 / 7. 48.100
 libswscale 5. 4.100 / 5. 4.100
 libswresample 3. 4.100 / 3. 4.100
 libpostproc 55. 4.100 / 55. 4.100
[h264 @ 02a46240] non-existing PPS 0 referenced
[h264 @ 02a46240] decode_slice_header error
[h264 @ 02a46240] no frame!
...
[h264 @ 02a46240] non-existing PPS 0 referenced
[h264 @ 02a46240] decode_slice_header error
[h264 @ 02a46240] no frame!
[mov,mp4,m4a,3gp,3g2,mj2 @ 02a35380] decoding for stream 0 failed
[mov,mp4,m4a,3gp,3g2,mj2 @ 02a35380] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 352x288, 320 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\Fabrice\Desktop\video\Test.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.26.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 323 kb/s
 Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none, 352x288, 320 kb/s, 25.11 fps, 25 tbr, 12800 tbn, 25600 tbc (default)
 Metadata:
 handler_name : VideoHandler


Here is the code I use to genererate my mp4 File, it's based on sample from ffmpeg (see : FFMPEG Muxing sample). I have tried to adapt it without using deprecated function. It works using webm/vp8 encoding, but not mp4/h264.


#include 
#include 
#include 
extern "C"
{
#include <libavcodec></libavcodec>avcodec.h>
#include <libswscale></libswscale>swscale.h>
#include <libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>error.h> 
#include <libavutil></libavutil>opt.h>
#include <libavutil></libavutil>imgutils.h>
}

#pragma comment(lib, "avcodec.lib")
#pragma comment(lib, "swscale.lib")
#pragma comment(lib, "avformat.lib")
#pragma comment(lib, "avutil.lib")

/* 10 seconds stream duration */
#define STREAM_DURATION 10.0
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */

//#pragma warning(disable : 4996) // TODO: remove

static int sws_flags = SWS_BICUBIC;

/* Add an output stream. */
static AVStream *add_stream(AVFormatContext *formatContext, AVCodec **codec, enum AVCodecID codecId, AVCodecContext **codecCtx)
{
 AVStream *stream;

 // Get the encoder codec
 *codec = avcodec_find_encoder(codecId);
 if (!(*codec)) {
 fprintf(stderr, "Could not find encoder for '%s'\n",
 avcodec_get_name(codecId));
 exit(1);
 }

 // Get the stream for codec
 stream = avformat_new_stream(formatContext, *codec);
 if (!stream) {
 fprintf(stderr, "Could not allocate stream\n");
 exit(1);
 }
 stream->id = formatContext->nb_streams - 1;

 (*codecCtx) = avcodec_alloc_context3(*codec);

 switch ((*codec)->type) {
 case AVMEDIA_TYPE_VIDEO:
 stream->codecpar->codec_id = codecId;
 stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 stream->codecpar->bit_rate = 400000;
 stream->codecpar->width = 352;
 stream->codecpar->height = 288;
 stream->codecpar->format = STREAM_PIX_FMT;
 stream->time_base = { 1, STREAM_FRAME_RATE };

 avcodec_parameters_to_context((*codecCtx), stream->codecpar);
 (*codecCtx)->gop_size = 12; /* emit one intra frame every twelve frames at most */
 (*codecCtx)->max_b_frames = 2;
 (*codecCtx)->time_base = { 1, STREAM_FRAME_RATE };
 if ((*codecCtx)->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 /* Needed to avoid using macroblocks in which some coeffs overflow.
 * This does not happen with normal video, it just happens here as
 * the motion of the chroma plane does not match the luma plane. */
 (*codecCtx)->mb_decision = 2;
 }
 break;

 default:
 break;
 }
 
 //if (stream->codecpar->codec_id == AV_CODEC_ID_H264) {
 // av_opt_set(codecCtx, "preset", "ultrafast", 0);
 //}
 //(*codecCtx)->flags |= AV_CODEC_FLAG_LOW_DELAY;

 /* Some formats want stream headers to be separate. */
 if (formatContext->oformat->flags & AVFMT_GLOBALHEADER)
 (*codecCtx)->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;


 int ret = avcodec_parameters_from_context(stream->codecpar, (*codecCtx));
 if (ret < 0) {
 char error[255];
 av_strerror(ret, error, 255);
 fprintf(stderr, "avcodec_parameters_from_context returned (%d) - %s", ret, error);
 return false;
 }

 return stream;
}

/**************************************************************/
/* video output */

static AVFrame *frame_video;
static int frame_count;

static void open_video(AVCodec *codec, AVStream *stream, AVCodecContext *codecCtx)
{
 int ret;

 /* open the codec */
 ret = avcodec_open2(codecCtx, codec, NULL);
 if (ret < 0) {
 char error[255];
 av_strerror(ret, error, 255);
 fprintf(stderr, "Could not open video codec: %s\n", error);
 exit(1);
 }

 /* allocate and init a re-usable frame */
 frame_video = av_frame_alloc();
 if (!frame_video) {
 fprintf(stderr, "Could not allocate video frame\n");
 exit(1);
 }

 frame_video->format = codecCtx->pix_fmt;
 frame_video->width = codecCtx->width;
 frame_video->height = codecCtx->height;

 ret = av_frame_get_buffer(frame_video, 32);
 if (ret < 0) {
 fprintf(stderr, "Could not allocate the video frame data\n");
 exit(1);
 }
}

/* Prepare a dummy image. */
static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
{
 int x, y, i;

 i = frame_index;

 /* Y */
 for (y = 0; y < height; y++)
 for (x = 0; x < width; x++)
 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;

 /* Cb and Cr */
 for (y = 0; y < height / 2; y++) {
 for (x = 0; x < width / 2; x++) {
 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
 }
 }
}

int timestamp = 0;
static void write_video_frame(AVFormatContext *formatContext, AVStream *stream, AVCodecContext *codecCtx)
{
 int ret;
 static struct SwsContext *sws_ctx;

 if (frame_count >= STREAM_NB_FRAMES) {
 /* No more frames to compress. The codec has a latency of a few
 * frames if using B-frames, so we get the last frames by
 * passing the same picture again. */
 }
 else {
 if (codecCtx->pix_fmt != AV_PIX_FMT_YUV420P) {
 /* as we only generate a YUV420P picture, we must convert it
 * to the codec pixel format if needed */
 if (!sws_ctx) {
 sws_ctx = sws_getContext(codecCtx->width, codecCtx->height, AV_PIX_FMT_YUV420P,
 codecCtx->width, codecCtx->height, codecCtx->pix_fmt,
 sws_flags, NULL, NULL, NULL);
 if (!sws_ctx) {
 fprintf(stderr, "Could not initialize the conversion context\n");
 exit(1);
 }
 }
 fill_yuv_image(frame_video, frame_count, codecCtx->width, codecCtx->height);
 sws_scale(sws_ctx, (const uint8_t * const *)frame_video->data, frame_video->linesize,
 0, codecCtx->height, frame_video->data, frame_video->linesize);
 }
 else {
 fill_yuv_image(frame_video, frame_count, codecCtx->width, codecCtx->height);
 }
 }

 frame_video->format = AV_PIX_FMT_YUV420P;
 frame_video->width = codecCtx->width;
 frame_video->height = codecCtx->height;

 if (formatContext->oformat->flags & 0x0020) {
 /* Raw video case - directly store the picture in the packet */
 AVPacket pkt;
 av_init_packet(&pkt);

 pkt.flags |= AV_PKT_FLAG_KEY;
 pkt.stream_index = stream->index;
 pkt.data = frame_video->data[0];
 pkt.size = sizeof(AVPicture);

 ret = av_interleaved_write_frame(formatContext, &pkt);
 }
 else {
 AVPacket pkt = { 0 };
 av_init_packet(&pkt);

 /* encode the image */
 fprintf(stderr, "\nFrame type : %c\n", av_get_picture_type_char(frame_video->pict_type));
 fprintf(stderr, "Frame pts: %lld, \n", frame_video->pts);
 fprintf(stderr, "Codec timebase: %d/%d\n", codecCtx->time_base.num, codecCtx->time_base.den);
 fprintf(stderr, "Stream timebase: %d/%d\n", stream->time_base.num, stream->time_base.den);
 fprintf(stderr, "Resacale: %lld, \n\n", av_rescale_q(1, codecCtx->time_base, stream->time_base));
 ret = avcodec_send_frame(codecCtx, frame_video);
 if (ret < 0) {
 char error[255];
 av_strerror(ret, error, 255);
 fprintf(stderr, "Error encoding video frame: %s\n", error);
 exit(1);
 }
 /* If size is zero, it means the image was buffered. */
 ret = avcodec_receive_packet(codecCtx, &pkt);
 if (!ret && pkt.size) {
 pkt.stream_index = stream->index;
 fprintf(stderr, "Packet flags : %d\n", pkt.flags);
 fprintf(stderr, "Packet pts: %lld\n", pkt.pts);
 fprintf(stderr, "Packet dts: %lld\n", pkt.dts);
 fprintf(stderr, "Packet duration: %lld\n", pkt.duration);
 fprintf(stderr, "Packet pos: %lld\n\n", pkt.pos);
 
 /* Write the compressed frame to the media file. */
 ret = av_interleaved_write_frame(formatContext, &pkt);
 }
 else {
 ret = 0;
 }
 }
 if (ret != 0) {
 char error[255];
 av_strerror(ret, error, 255);
 fprintf(stderr, "Error while writing video frame: %s\n", error);
 exit(1);
 }
 frame_count++;
}

static void close_video(AVFormatContext *oc, AVStream *st)
{
 av_free(frame_video->data[0]);
 av_free(frame_video);
}

/**************************************************************/
/* media file output */

int main(int argc, char **argv)
{
 // The outputed media
 char filename[100];
 const char *mediaFormat = "mp4"; AVCodecID mediaVideoCodec = AV_CODEC_ID_H264;
 //const char *mediaFormat="webm"; AVCodecID mediaVideoCodec = AV_CODEC_ID_VP8;
 AVOutputFormat *formatOut;
 AVFormatContext *formatCtx;

 // The video stream
 AVStream *stream_video;
 AVCodec *codec_video = nullptr;
 AVCodecContext *codecCtx_video = nullptr;
 double time_video = 0;

 // Return code
 int ret;

 strcpy_s(filename, "C:\\Test.");
 strcat_s(filename, mediaFormat);

 // allocate the output media context
 avformat_alloc_output_context2(&formatCtx, NULL, NULL, filename);
 if (!formatCtx) {
 return 1;
 }
 formatOut = formatCtx->oformat;

 // Add the video stream using H264 codec
 stream_video = NULL;
 stream_video = add_stream(formatCtx, &codec_video, mediaVideoCodec, &codecCtx_video);

 // Open video codec and allocate the necessary encode buffers
 if (stream_video)
 open_video(codec_video, stream_video, codecCtx_video);

 av_dump_format(formatCtx, 0, filename, 1);

 // Open the output media file, if needed
 if (!(formatOut->flags & AVFMT_NOFILE)) {
 ret = avio_open(&formatCtx->pb, filename, AVIO_FLAG_WRITE);
 if (ret < 0) {
 char error[255];
 av_strerror(ret, error, 255);
 fprintf(stderr, "Could not open '%s': %s\n", filename, error);
 return 1;
 }
 }

 // Write media header
 ret = avformat_write_header(formatCtx, NULL);
 if (ret < 0) {
 char error[255];
 av_strerror(ret, error, 255);
 fprintf(stderr, "Error occurred when opening output file: %s\n", error);
 return 1;
 }

 if (frame_video)
 frame_video->pts = 0;
 for (;;) {
 // Compute video time from last added video frame
 time_video = ((double)frame_video->pts) * av_q2d(stream_video->time_base);

 // Stop media if enough time
 if (!stream_video || time_video >= STREAM_DURATION)
 break;

 // Add a video frame
 write_video_frame(formatCtx, stream_video, codecCtx_video);

 // Increase frame pts according to time base
 frame_video->pts += av_rescale_q(1, codecCtx_video->time_base, stream_video->time_base);
 }

 // Write media trailer
 av_write_trailer(formatCtx);

 /* Close each codec. */
 if (stream_video)
 close_video(formatCtx, stream_video);

 if (!(formatOut->flags & AVFMT_NOFILE))
 /* Close the output file. */
 avio_close(formatCtx->pb);

 /* free the stream */
 avformat_free_context(formatCtx);

 return 0;
}


What am I missing ? Which part give me this error ?


-
ffprobe reports some wrong meta data but only when input is piped in
17 juillet 2020, par spinkusI have a video file and I'm using
ffprobeto extract meta data from it. If I save the file to disk and runffprobeeverything works fine. However, if I pipe the input intoffprobemost meta data is correct, but some fields, such aswidth,height,display_aspect_ratioare not correct.ffprobereports these errors when input is a stream (see full outputs below) :



[mov,mp4,m4a,3gp,3g2,mj2 @ 0x563c3de3c000] stream 1, offset 0x2c : partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x563c3de3c000] Could not find codec parameters for stream 0 (Video : mpeg4 (mp4v / 0x7634706D), none, 1567 kb/s) : unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options




I tried various settings for
analyzedurationandprobesizewith no change in outcome. I tried piping other even larger MP4 files into ffprobe and the height and width is reported correctly, and I don't get "stream 1, offset 0x2c : partial file" output warning. I think there is may be some issue with this particular file, but if that's the case why does it only cause issues when the file is streamed in ?

Any ideas what the issue is and how to get
ffprobeto work same with a pipe as for a file input ?

With file :


> ffprobe -show_streams camera-test.mp4 
ffprobe version 4.1.6-1~deb10u1 Copyright (c) 2007-2020 the FFmpeg developers
 built with gcc 8 (Debian 8.3.0-6)
 configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 libavutil 56. 22.100 / 56. 22.100
 libavcodec 58. 35.100 / 58. 35.100
 libavformat 58. 20.100 / 58. 20.100
 libavdevice 58. 5.100 / 58. 5.100
 libavfilter 7. 40.101 / 7. 40.101
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 3.100 / 5. 3.100
 libswresample 3. 3.100 / 3. 3.100
 libpostproc 55. 3.100 / 55. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'camera-test.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2mp41
 encoder : Lavf58.35.101
 Duration: 00:00:05.74, start: 0.000000, bitrate: 1650 kb/s
 Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 1567 kb/s, 30 fps, 30 tbr, 15360 tbn, 30 tbc (default)
 Metadata:
 handler_name : VideoHandle
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 121 kb/s (default)
 Metadata:
 handler_name : SoundHandle
[STREAM]
index=0
codec_name=mpeg4
codec_long_name=MPEG-4 part 2
profile=Simple Profile
codec_type=video
codec_time_base=1/30
codec_tag_string=mp4v
codec_tag=0x7634706d
width=720
height=1280
coded_width=720
coded_height=1280
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=9:16
pix_fmt=yuv420p
level=1
...


With a pipe :


> ffprobe -show_streams "pipe:0" 56. 22.100
 libavcodec 58. 35.100 / 58. 35.100
 libavformat 58. 20.100 / 58. 20.100
 libavdevice 58. 5.100 / 58. 5.100
 libavfilter 7. 40.101 / 7. 40.101
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 3.100 / 5. 3.100
 libswresample 3. 3.100 / 3. 3.100
 libpostproc 55. 3.100 / 55. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x563c3de3c000] stream 1, offset 0x2c: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x563c3de3c000] Could not find codec parameters for stream 0 (Video: mpeg4 (mp4v / 0x7634706D), none, 1567 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2mp41
 encoder : Lavf58.35.101
 Duration: 00:00:05.74, start: 0.000000, bitrate: N/A
 Stream #0:0(eng): Video: mpeg4 (mp4v / 0x7634706D), none, 1567 kb/s, SAR 1:1 DAR 0:0, 30 fps, 30 tbr, 15360 tbn, 15360 tbc (default)
 Metadata:
 handler_name : VideoHandle
 Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 121 kb/s (default)
 Metadata:
 handler_name : SoundHandle
[STREAM]
index=0
codec_name=mpeg4
codec_long_name=MPEG-4 part 2
profile=unknown
codec_type=video
codec_time_base=1/30
codec_tag_string=mp4v
codec_tag=0x7634706d
width=0
height=0
coded_width=0
coded_height=0
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=0:0
pix_fmt=unknown
level=-99
...


Full diff between the two outputs :


< profile=unknown
---
> profile=Simple Profile
10,13c10,13
< width=0
< height=0
< coded_width=0
< coded_height=0
---
> width=720
> height=1280
> coded_width=720
> coded_height=1280
16,18c16,18
< display_aspect_ratio=0:0
< pix_fmt=unknown
< level=-99
---
> display_aspect_ratio=9:16
> pix_fmt=yuv420p
> level=1
62c62
< profile=unknown
---
> profile=LC


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