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• Can't play mp4 video using html5 video tag

  7 août 2020, par John Doe

  I am trying to present an mp4 video (h264) using html5 :

  


  <video width="320" controls="controls">&#xA;            <source src="/home/nabil/FWork/hikvision/ch01_00000100068000101.mp4" type="video/mp4">&#xA;</source></video>&#xA;

  


  analyzing video codec with ffmpeg gives the following :

  


  ffprobe ch01_00000100068000101.mp4 
ffprobe version 2.8.17-0ubuntu0.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Invalid UE golomb code
    Last message repeated 3 times
Input #0, mpeg, from 'ch01_00000100068000101.mp4':
  Duration: 00:09:27.33, start: 35024.106667, bitrate: 507 kb/s
    Stream #0:0[0x1e0]: Video: h264 (Baseline), yuv420p, 1280x720, 10 fps, 10 tbr, 90k tbn, 20 tbc


  


  a possible relevant detail is that playing the video using ubuntu's default video reader (ffmpeg in the background) doesn't show any video controls

  


• FFMPEG cannot find H264 encoder

  31 juillet 2020, par Serban Stoenescu

  I am running ffmpeg from a program, and we built ffmpeg ourselves (we did not install it with package managers or pre-built stuff).
This is the command that is built :

  


  2020-07-31 12:14:11.942 INFO ffmpeg::FFTranscoder Executing: "../deps/ffmpeg/bin/ffmpeg" -y -r 26.062 -i ""/home/sstoenescu/Work/myproject/sample/myvideo.h264"" -c:v openh264 -vcodec h264 -movflags +faststart ""/home/sstoenescu/Work/myproject/sample/myvideo.mp4""


  


  The file myvideo.h264 is valid, I can play it with ffplay and I can run ffprobe on it without problems.
However, the command above gives this error :

  


  ffmpeg version N-98068-g16bdc2b541 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --arch=x86_64 --cpu=nehalem --disable-ffplay --enable-shared --enable-network --enable-gpl --enable-libx265 --enable-encoder=libx265 --disable-hwaccels --enable-hwaccel=h264_qsv --enable-hwaccel=h264_vaapi
  libavutil      56. 50.100 / 56. 50.100
  libavcodec     58. 90.100 / 58. 90.100
  libavformat    58. 44.100 / 58. 44.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 84.100 /  7. 84.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[h264 @ 0x5597c38defc0] error while decoding MB 86 45, bytestream -30
[h264 @ 0x5597c38defc0] concealing 2723 DC, 2723 AC, 2723 MV errors in I frame
Input #0, h264, from '/home/sstoenescu/Work/edvr/laba/gaoazar.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 50 tbc
Multiple -c, -codec, -acodec, -vcodec, -scodec or -dcodec options specified for stream 0, only the last option '-c:v h264' will be used.
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_v4l2m2m))
Press [q] to stop, [?] for help
[h264 @ 0x5597c38e30c0] error while decoding MB 86 45, bytestream -30
[h264 @ 0x5597c38e30c0] concealing 2723 DC, 2723 AC, 2723 MV errors in I frame
[h264_v4l2m2m @ 0x5597c3905500] Could not find a valid device
[h264_v4l2m2m @ 0x5597c3905500] can't configure encoder
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  


  It used to work, I did not change anything in the command, so I'm assuming it's something in the way we build ffmpeg. We are using these flags : --enable-decoder=h264 --enable-encoder=h264_qsv    --enable-encoder=h264_vaapi --enable-decoder=h264 --enable-decoder=h264_qsv
Here's the full configuration :

  


  ./configure \
    --arch=x86_64 --cpu=nehalem \
    --disable-ffplay --enable-shared \
    --enable-network \
    --enable-gpl --enable-libx265 \
    --enable-encoder=libx265\
    --disable-hwaccels --enable-hwaccel=h264_qsv --enable-hwaccel=h264_vaapi \
     #--enable-encoder=libopenh264 \
     --enable-encoder=h264_qsv \
        --enable-encoder=h264_vaapi --enable-encoder=mjpeg --enable-encoder=gif \
    --enable-decoder=h264 --enable-decoder=h264_qsv \
        #--enable-decoder=libopenh264 
    --enable-libx264 \
        --enable-decoder=png \
    --enable-protocol=tcp \
    --enable-demuxer=rtsp --enable-demuxer=mov --enable-demuxer=h264 --enable-demuxer=image2 \
    --enable-muxer=mp4 --enable-muxer=h264 --enable-muxer=image2 \
    --prefix="./build"\
    --disable-doc


  


  Any ideas what could be wrong ?
Thanks.

  


  Regards,
Serban

  


• ffmpeg -ss then apply filter then concat producing timestamp errors

  6 août 2020, par Bob Ramsey

  Using ffmpeg, I have split a file into multiple parts using -ss. Then I apply a filter to some of the files, then concat the files back together. When I do that, I get : Non-monotonous DTS in output stream 0:0 ; previous : 341334, current : 340526 ; changing to 341335. This may result in incorrect timestamps in the output file. The output file plays, but there are noticeable skips where the files are joined.

  


  Here's how I am splitting the file :

  


  ffmpeg -i full_source.mp4 -ss 0 -to 14.264250 -c copy  01-plain.mp4
ffmpeg -i full_source.mp4 -ss 14.264250 -to 18.435083 -c copy  01-filtered.mp4

ffmpeg -i full_source.mp4 -ss 18.435083 -to 29.988292 -c copy  02-plain.mp4
ffmpeg -i full_source.mp4 -ss 29.988292 -to 31.865167 -c copy  02-filtered.mp4
...
ffmpeg -i full_source.mp4 -ss 0 -to 14.264250 -c copy  10-plain.mp4
ffmpeg -i full_source.mp4 -ss 234.484203 -to 300.000 -c copy  10-filtered.mp4


  


  Then I apply a different drawtext filter on each of the 10 filtered files and save them with a new name, like :

  


  ffmpeg -hide_banner -loglevel warning -y -i 01-filtered.mp4 -filter_complex "drawtext=fontfile=calibri.ttf:fontsize=24:fontcolor=white:x=300:y=500:text='hello world'" -crf 15 01-filtered-complete.mp4


  


  Finally, I join all of the plain and complete files back together like this :

  


  ffmpeg  -f concat -safe 0 -i mylist.txt -c:a copy -c:v copy  outfile.mp4


  


  And that's where the timing error comes in. I've tried adding -vsync drop in the concat command, but that didn't really work either. Same version of ffmpeg does the split, the filter, and the concat. I've tried different versions, everything from 20170519 to one from May 2020 with the same result. Always making sure that all three steps are done by the same version of ffmpeg.

  


  The only thing I can see is that ffprobe shows a duration of 14.27 for 01-plain.mp4 when it should be 14.264250. All of the other files show a similar rounding difference. The files are 23.98 fps. If I do all of my filters in really long command without splitting the file, I can use the more precise numbers with no problem. It just takes 10 times as long. This is all scripted, it happens a couple of hundred times a day and time is money, so I can't take 10 times as long to do each file.

  


  Any ideas ? Thanks in advance !