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Autres articles (81)

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Sur d’autres sites (5889)

android - ffmpeg output audio contains garbled sound at the end

31 mai 2017, par Sha

I’m converting an audio (recorded via android phone with output type MPEG_4 and encoder DEFAULT) to mp3 using ffmpeg like this :

-y -i /data/user/0/com.whispero.mithoo/files/input.mp3 -codec:a libmp3lame -qscale:a 2 /data/user/0/com.whispero.mithoo/files/output.mp3

if the input audio is >20 seconds, there’s garbled audio at the end in the converted output file, otherwise if it’s <20 seconds, the output is fine.

log :

05-31 15:54:41.760 11922-11922/com.home.myapp E/onStart: onStart

05-31 15:54:41.788 11922-11922/com.home.myapp E/first visible: 18: 4: total22,last:21

05-31 15:54:42.046 11922-11922/com.home.myapp E/onProgress: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers

05-31 15:54:42.046 11922-11922/com.home.myapp E/onProgress:   built with gcc 4.8 (GCC)

05-31 15:54:42.047 11922-11922/com.home.myapp E/onProgress:   configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=

05-31 15:54:42.047 11922-11922/com.home.myapp E/onProgress:   libavutil      55. 17.103 / 55. 17.103

05-31 15:54:42.047 11922-11922/com.home.myapp E/onProgress:   libavcodec     57. 24.102 / 57. 24.102

05-31 15:54:42.047 11922-11922/com.home.myapp E/onProgress:   libavformat    57. 25.100 / 57. 25.100

05-31 15:54:42.048 11922-11922/com.home.myapp E/onProgress:   libavdevice    57.  0.101 / 57.  0.101

05-31 15:54:42.048 11922-11922/com.home.myapp E/onProgress:   libavfilter     6. 31.100 /  6. 31.100

05-31 15:54:42.048 11922-11922/com.home.myapp E/onProgress:   libswscale      4.  0.100 /  4.  0.100

05-31 15:54:42.048 11922-11922/com.home.myapp E/onProgress:   libswresample   2.  0.101 /  2.  0.101

05-31 15:54:42.049 11922-11922/com.home.myapp E/onProgress:   libpostproc    54.  0.100 / 54.  0.100

05-31 15:54:42.053 11922-11922/com.home.myapp E/onProgress: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.home.myapp/files/166_31052017155411.mp3':

05-31 15:54:42.053 11922-11922/com.home.myapp E/onProgress:   Metadata:

05-31 15:54:42.053 11922-11922/com.home.myapp E/onProgress:     major_brand     : mp42

05-31 15:54:42.054 11922-11922/com.home.myapp E/onProgress:     minor_version   : 0

05-31 15:54:42.054 11922-11922/com.home.myapp E/onProgress:     compatible_brands: isommp42

05-31 15:54:42.054 11922-11922/com.home.myapp E/onProgress:     creation_time   : 2017-05-31 10:54:41

05-31 15:54:42.055 11922-11922/com.home.myapp E/onProgress:     com.android.version: 6.0.1

05-31 15:54:42.055 11922-11922/com.home.myapp E/onProgress:   Duration: 00:00:29.98, start: 0.000000, bitrate: 15 kb/s

05-31 15:54:42.056 11922-11922/com.home.myapp E/onProgress:     Stream #0:0(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s (default)

05-31 15:54:42.057 11922-11922/com.home.myapp E/onProgress:     Metadata:

05-31 15:54:42.059 11922-11922/com.home.myapp E/onProgress:       creation_time   : 2017-05-31 10:54:41

05-31 15:54:42.059 11922-11922/com.home.myapp E/onProgress:       handler_name    : SoundHandle

05-31 15:54:42.089 11922-11922/com.home.myapp E/onProgress: Output #0, mp3, to '/data/user/0/com.home.myapp/files/166_31052017155411.mp3':

05-31 15:54:42.090 11922-11922/com.home.myapp E/onProgress:   Metadata:

05-31 15:54:42.090 11922-11922/com.home.myapp E/onProgress:     major_brand     : mp42

05-31 15:54:42.091 11922-11922/com.home.myapp E/onProgress:     minor_version   : 0

05-31 15:54:42.092 11922-11922/com.home.myapp E/onProgress:     compatible_brands: isommp42

05-31 15:54:42.093 11922-11922/com.home.myapp E/onProgress:     com.android.version: 6.0.1

05-31 15:54:42.095 11922-11922/com.home.myapp E/onProgress:     TSSE            : Lavf57.25.100

05-31 15:54:42.095 11922-11922/com.home.myapp E/onProgress:     Stream #0:0(eng): Audio: mp3 (libmp3lame), 8000 Hz, mono, fltp (default)

05-31 15:54:42.096 11922-11922/com.home.myapp E/onProgress:     Metadata:

05-31 15:54:42.097 11922-11922/com.home.myapp E/onProgress:       creation_time   : 2017-05-31 10:54:41

05-31 15:54:42.098 11922-11922/com.home.myapp E/onProgress:       handler_name    : SoundHandle

05-31 15:54:42.098 11922-11922/com.home.myapp E/onProgress:       encoder         : Lavc57.24.102 libmp3lame

05-31 15:54:42.099 11922-11922/com.home.myapp E/onProgress: Stream mapping:

05-31 15:54:42.100 11922-11922/com.home.myapp E/onProgress:   Stream #0:0 -> #0:0 (amr_nb (amrnb) -> mp3 (libmp3lame))

05-31 15:54:42.100 11922-11922/com.home.myapp E/onProgress: Press [q] to stop, [?] for help

05-31 15:54:42.595 11922-11922/com.home.myapp E/onProgress: size=      18kB time=00:00:05.54 bitrate=  27.0kbits/s speed=11.1x    

05-31 15:54:43.096 11922-11922/com.home.myapp E/onProgress: size=      43kB time=00:00:13.32 bitrate=  26.6kbits/s speed=13.3x    

05-31 15:54:43.518 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.518 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.525 11922-11922/com.home.myapp E/onProgress: Multiple frames in a packet from stream 0

05-31 15:54:43.525 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.538 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.540 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.540 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.541 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.541 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.542 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.543 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.543 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] dtx mode is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

05-31 15:54:43.544 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Note: libopencore_amrnb supports dtx

05-31 15:54:43.544 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Not yet implemented in FFmpeg, patches welcome

05-31 15:54:43.545 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.546 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.546 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.547 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.547 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.548 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.549 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.549 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.550 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.551 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.551 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.552 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.552 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.553 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.554 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.555 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.556 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] dtx mode is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

05-31 15:54:43.557 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Note: libopencore_amrnb supports dtx

05-31 15:54:43.558 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Not yet implemented in FFmpeg, patches welcome

05-31 15:54:43.559 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] dtx mode is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

05-31 15:54:43.560 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Note: libopencore_amrnb supports dtx

05-31 15:54:43.561 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Not yet implemented in FFmpeg, patches welcome

05-31 15:54:43.562 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:43.563 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:43.563 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.519 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Not yet implemented in FFmpeg, patches welcome

05-31 15:54:44.521 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.522 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.523 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.524 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.526 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.527 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.530 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.531 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.532 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.533 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.534 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.535 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.536 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.537 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.538 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.539 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.540 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.541 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.542 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.543 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.544 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.545 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.546 11922-11922/com.home.myapp E/onProgress: [amrnb @ 0xb5bc3400] Corrupt bitstream

05-31 15:54:44.548 11922-11922/com.home.myapp E/onProgress: Error while decoding stream #0:0: Invalid data found when processing input

05-31 15:54:44.549 11922-11922/com.home.myapp E/onProgress: size=      90kB time=00:00:30.03 bitrate=  24.6kbits/s speed=16.6x    

05-31 15:54:44.556 11922-11922/com.home.myapp E/onProgress: video:0kB audio:90kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.425926%

05-31 15:54:44.558 11922-11922/com.home.myapp E/SUCCESS: SUCCESS

05-31 15:54:44.558 11922-11922/com.home.myapp E/onFinish: onFinish

My MediaRecorder settings are :

mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

mRecorder.setAudioSamplingRate(24000);

mRecorder.setAudioEncodingBitRate(32000);

Log.e("Path","Createdfilepath:"+mFile.getPath());

mRecorder.setOutputFile(mFile.getPath());

mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);

FFmpeg, MPEG4 video rotate and Windows

25 décembre 2017, par user3768884

I have this kind of video recorded in some Samsung Galaxy phone (info from : "ffprobe -v error -show_format -show_streams filename.mp4")

[STREAM]

index=0

codec_name=h264

codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10

profile=High

codec_type=video

codec_time_base=7048499/423000000

codec_tag_string=avc1

codec_tag=0x31637661

width=1920

height=1080

coded_width=1920

coded_height=1080

has_b_frames=0

sample_aspect_ratio=0:1

display_aspect_ratio=0:1

pix_fmt=yuv420p

level=40

color_range=unknown

color_space=unknown

color_transfer=unknown

color_primaries=unknown

chroma_location=left

field_order=unknown

timecode=N/A

refs=1

is_avc=true

nal_length_size=4

id=N/A

r_frame_rate=30/1

avg_frame_rate=211500000/7048499

time_base=1/90000

start_pts=0

start_time=0.000000

duration_ts=7048499

duration=78.316656

bit_rate=17010472

max_bit_rate=N/A

bits_per_raw_sample=8

nb_frames=2350

nb_read_frames=N/A

nb_read_packets=N/A

DISPOSITION:default=1

DISPOSITION:dub=0

DISPOSITION:original=0

DISPOSITION:comment=0

DISPOSITION:lyrics=0

DISPOSITION:karaoke=0

DISPOSITION:forced=0

DISPOSITION:hearing_impaired=0

DISPOSITION:visual_impaired=0

DISPOSITION:clean_effects=0

DISPOSITION:attached_pic=0

DISPOSITION:timed_thumbnails=0

TAG:rotate=90

TAG:creation_time=2017-12-17T13:42:14.000000Z

TAG:language=eng

TAG:handler_name=VideoHandle

[SIDE_DATA]

side_data_type=Display Matrix

displaymatrix=

00000000:            0       65536           0

00000001:       -65536           0           0

00000002:            0           0  1073741824



rotation=-90

[/SIDE_DATA]

[/STREAM]

[STREAM]

index=1

codec_name=aac

codec_long_name=AAC (Advanced Audio Coding)

profile=LC

codec_type=audio

codec_time_base=1/48000

codec_tag_string=mp4a

codec_tag=0x6134706d

sample_fmt=fltp

sample_rate=48000

channels=2

channel_layout=stereo

bits_per_sample=0

id=N/A

r_frame_rate=0/0

avg_frame_rate=0/0

time_base=1/48000

start_pts=0

start_time=0.000000

duration_ts=3772416

duration=78.592000

bit_rate=126154

max_bit_rate=128000

bits_per_raw_sample=N/A

nb_frames=3684

nb_read_frames=N/A

nb_read_packets=N/A

DISPOSITION:default=1

DISPOSITION:dub=0

DISPOSITION:original=0

DISPOSITION:comment=0

DISPOSITION:lyrics=0

DISPOSITION:karaoke=0

DISPOSITION:forced=0

DISPOSITION:hearing_impaired=0

DISPOSITION:visual_impaired=0

DISPOSITION:clean_effects=0

DISPOSITION:attached_pic=0

DISPOSITION:timed_thumbnails=0

TAG:creation_time=2017-12-17T13:42:14.000000Z

TAG:language=eng

TAG:handler_name=SoundHandle

[/STREAM]

[FORMAT]

filename=original_galaxy.mp4

nb_streams=2

nb_programs=0

format_name=mov,mp4,m4a,3gp,3g2,mj2

format_long_name=QuickTime / MOV

start_time=0.000000

duration=78.592000

size=167808936

bit_rate=17081528

probe_score=100

TAG:major_brand=isom

TAG:minor_version=0

TAG:compatible_brands=isom3gp4

TAG:creation_time=2017-12-17T13:42:14.000000Z

[/FORMAT]

Since all my media players does not support rotate-knowledge, I have turned the video over again, and at the same time slightly decreased the resolution of command "ffmpeg -i "input.mp4" -vf "scale=720:1280,transpose=0,transpose=0" -c:a copy "output.mp4""

[STREAM]

index=0

codec_name=h264

codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10

profile=High

codec_type=video

codec_time_base=1/60

codec_tag_string=avc1

codec_tag=0x31637661

width=720

height=1280

coded_width=720

coded_height=1280

has_b_frames=2

sample_aspect_ratio=0:1

display_aspect_ratio=0:1

pix_fmt=yuv420p

level=31

color_range=unknown

color_space=unknown

color_transfer=unknown

color_primaries=unknown

chroma_location=left

field_order=unknown

timecode=N/A

refs=1

is_avc=true

nal_length_size=4

id=N/A

r_frame_rate=30/1

avg_frame_rate=30/1

time_base=1/15360

start_pts=0

start_time=0.000000

duration_ts=1203717

duration=78.366992

bit_rate=2570692

max_bit_rate=N/A

bits_per_raw_sample=8

nb_frames=2351

nb_read_frames=N/A

nb_read_packets=N/A

DISPOSITION:default=1

DISPOSITION:dub=0

DISPOSITION:original=0

DISPOSITION:comment=0

DISPOSITION:lyrics=0

DISPOSITION:karaoke=0

DISPOSITION:forced=0

DISPOSITION:hearing_impaired=0

DISPOSITION:visual_impaired=0

DISPOSITION:clean_effects=0

DISPOSITION:attached_pic=0

DISPOSITION:timed_thumbnails=0

TAG:language=eng

TAG:handler_name=VideoHandler

[/STREAM]

[STREAM]

index=1

codec_name=aac

codec_long_name=AAC (Advanced Audio Coding)

profile=LC

codec_type=audio

codec_time_base=1/48000

codec_tag_string=mp4a

codec_tag=0x6134706d

sample_fmt=fltp

sample_rate=48000

channels=2

channel_layout=stereo

bits_per_sample=0

id=N/A

r_frame_rate=0/0

avg_frame_rate=0/0

time_base=1/48000

start_pts=0

start_time=0.000000

duration_ts=3772416

duration=78.592000

bit_rate=126154

max_bit_rate=126154

bits_per_raw_sample=N/A

nb_frames=3684

nb_read_frames=N/A

nb_read_packets=N/A

DISPOSITION:default=1

DISPOSITION:dub=0

DISPOSITION:original=0

DISPOSITION:comment=0

DISPOSITION:lyrics=0

DISPOSITION:karaoke=0

DISPOSITION:forced=0

DISPOSITION:hearing_impaired=0

DISPOSITION:visual_impaired=0

DISPOSITION:clean_effects=0

DISPOSITION:attached_pic=0

DISPOSITION:timed_thumbnails=0

TAG:language=eng

TAG:handler_name=SoundHandler

[/STREAM]

[FORMAT]

filename=from_ffmpeg.mp4

nb_streams=2

nb_programs=0

format_name=mov,mp4,m4a,3gp,3g2,mj2

format_long_name=QuickTime / MOV

start_time=0.000000

duration=78.592000

size=26503544

bit_rate=2697836

probe_score=100

TAG:major_brand=isom

TAG:minor_version=512

TAG:compatible_brands=isomiso2avc1mp41

TAG:encoder=Lavf57.41.100

[/FORMAT]

This works very well in VLC, for example. However, Windows Media Player or Samsung TV does not play it. Windows Explorer does not even show a video thumbnail, so the video file is broken by Windows.

Is not FFmpeg able to produce a standard MPEG4 file, or what the hell is this about ? I’ve tried all the alternatives presented, such as "-fflags +genpts", "-fflags genpts", "-movflags faststart", "-movflags +faststart", "pix_fmt=yuv420p" etc. but nothing worked.

The sound I copied directly.

compress keynote compatible movie with alpha channel

26 janvier 2015, par John Smith
I am creating a movie with alpha channel by converting png-images with imagemagicks convert and then compiling the movie with ffmpeg :
```
ffmpeg -i image%04d_t.png -vcodec png -q:v 1 -compression_level 100 transparent.mov
```
I can import those movies into the latest (6.5.2) Apple Keynote, but they tend to be very large (560 frames of size 615x189, no sound, 22 sec. = 113 MB). Is there a way to convert the movie to a different format (that is also Keynote compatible) that uses less disk space ?

A second option would be to use a lower framerate for the same length (=using less frames) - would that save on file size and if so, what command would I use for that ?

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