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• ffmpeg : Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  20 novembre 2020, par Alexandre

  I'm experiencing troubles running ffmpeg on my synology. I'm trying to convert .avi video to mp4.

  



  Here is the command :

  



  ffmpeg -i vid20160623.avi -acodec libfaac -b:a 128k -vcodec mpeg4 -b:v 1200k -flags +aic+mv4 -f mp4 vid20160623.mp4

  



  And the logs :

  



  ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.3 (crosstool-NG 1.20.0) 20150311 (prerelease)
  configuration: --prefix=/usr --incdir='${prefix}/include/ffmpeg' --arch=arm --target-os=linux --cross-prefix=/usr/local/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi- --enable-cross-compile --enable-optimizations --enable-pic --enable-gpl --enable-shared --disable-static --enable-version3 --enable-nonfree --enable-libfaac --enable-encoders --enable-pthreads --disable-bzlib --disable-protocol=rtp --disable-muxer=image2 --disable-muxer=image2pipe --disable-swscale-alpha --disable-ffserver --disable-ffplay --disable-devices --disable-bzlib --disable-altivec --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --disable-vaapi --disable-decoder=amrnb --disable-encoder=zmbv --disable-encoder=dca --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=eac3 --disable-decoder=dca --disable-decoder=eac3 --disable-decoder=truehd --cc=/usr/local/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-ccache-gcc
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, avi, from 'vid20160623.avi':
  Metadata:
    encoder         : MEncoder git-ab94fc6-4.4.3
  Duration: 00:20:18.07, start: 0.000000, bitrate: 1197 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 624x352 [SAR 1:1 DAR 39:22], 1056 kb/s, 25 fps, 23.98 tbr, 25 tbn, 23.98 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s
Output #0, mp4, to vid20160623.mp4':
  Metadata:
    encoder         : MEncoder git-ab94fc6-4.4.3
    Stream #0:0: Video: mpeg4, none, q=2-31, 128 kb/s, SAR 351:352 DAR 0:0, 23.98 fps
    Metadata:
      encoder         : Lavc56.41.100 mpeg4
    Stream #0:1: Audio: aac, 0 channels, 128 kb/s
    Metadata:
      encoder         : Lavc56.41.100 libfaac
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
  Stream #0:1 -> #0:1 (mp3 (native) -> aac (libfaac))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  



  I tried to reduce b:a and b:v but it did not work.

  



  Any help will be welcome.

  


• drawbox around text with dynamic height in ffmpeg

  9 mars 2018, par Anuj TBE

  I’m working on a ffmpeg script to draw text over image/video.

  The text will be wrapped inside a box with full width and dynamic height.

  I have tried two approach to achieve this.

  1. using drawbox

  ffmpeg \
  
  -loop 1 -i /path_to_file/file.jpg \
  
  -t 5 -vf
  
  "scale=320:320,\
  
  drawbox=y=0\
  
  :color=#00FF29\
  
  :width=iw\
  
  :height=72\
  
  :t=max,\
  
  drawtext=text=TBE\
  
  :fontcolor=#F71DFF\
  
  :fontsize=82:x=(w-text_w)/2\
  
  :y=text_h/2" 
  
  /path_to_file/new_file.mp4 -y

  Which renders following three examples with different value of fontsize

  

  2. using box of drawtext

  ffmpeg -i in3.png -t 5 -vf drawtext=" \
  
  text='Stack Overflow': fontcolor=white: fontsize=54: box=1: boxcolor=black@0.5: \
  
  boxborderw=10: x=(w-text_w)/2: y=(h-text_h)/2" -codec:a copy output_new.mp4

  

  Half of the requirement is being fullfiled by drawbox (full width box) and half using drawtext box (box height according to text).

  How can I achieve both (full box width with dynamic height according to height of text) in ffmpeg ?

• qsv : align surface width/height to 16.

  6 mars 2018, par Ruiling Song

  qsv : align surface width/height to 16.
  Per MediaSDK documentation, it requires width/height to 16 alignment.
  
  Without this patch, hwupload pipeline may fail if 16 alignment is
  
  not met. Although this patch also apply 16 alignment to qsv encoder/decoder,
  
  it will not bring any side-effect to them as they are already aligned.
  Signed-off-by : Ruiling Song <ruiling.song@intel.com>
  
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavutil/hwcontext_qsv.c