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• FFmpeg : MD5 hash of M3U8 playlists generated from same input video with different segment durations (after applying video filter) don't match

  30 juillet 2020, par Saurabh P Bhandari

  Here are a few commands I am using to convert and transize a video in MP4 format to a M3U8 playlist.

  


  For a given input video (MP4 format), generate multiple video segments with segment duration 30 seconds.

  


  ffmpeg -loglevel error -i input.mp4 -dn -sn -an -c:v copy -bsf:v h264_mp4toannexb -copyts -start_at_zero -f segment -segment_time 30 30%03d.mp4 -dn -sn -vn -c:a copy audio.aac


  


  Apply a video filter (in this case scaling) on each segment and convert it to a M3U8 format.

  


  ls 30*.mp4 | parallel 'ffmpeg -loglevel error -i {} -vf scale=-2:144 -hls_list_size 0 {}.m3u8'


  


  Store the list of m3u8 files generated in list.txt in this format file 'segment-name.m3u8'

  


  for f in 30*.m3u8; do echo "file '$f'" >> list.txt; done


  


  Using concat demuxer, combine all segment files (which are in M3U8 format) and the audio to get one final m3u8 playlist pointing to segments with duration of 10 seconds.

  


  ffmpeg -loglevel error -f concat -i list.txt -i audio.aac -c copy -hls_list_size 0 -hls_time 10 output_30.m3u8


  


  ---

  


  I can change the segment duration in the first step from 30 seconds to 60 seconds, and compare the MD5 hash of the final M3U8 playlist generated in both the cases using this command :

  


  ffmpeg -loglevel error -i <input m3u8="m3u8" playlist="playlist" /> -f md5 -&#xA;

  


  The MD5 hash of the output files differ, i.e., video streams of output_30.m3u8 and output_60.m3u8 are not the same.

  


  Can anyone elaborate on this ?

  


  (I expected the MD5 hash to be the same)

  


• ffmpeg : md5 of m3u8 playlists generated from same input video with different segment durations (after applying video filter) don't match

  15 juillet 2020, par Saurabh P Bhandari

  Here are a few commands I am using to convert and transize a video in mp4 format to a m3u8 playlist.

  


  For a given input video (mp4 format), generate multiple video only segments with segment duration 30s

  


  ffmpeg -loglevel error -i input.mp4 -dn -sn -an -c:v copy -bsf:v h264_mp4toannexb -copyts -start_at_zero -f segment -segment_time 30 30%03d.mp4 -dn -sn -vn -c:a copy audio.aac


  


  Apply video filter (in this case scaling) on each segment and convert it to a m3u8 format

  


  ls 30*.mp4 | parallel 'ffmpeg -loglevel error -i {} -vf scale=-2:144 -hls_list_size 0 {}.m3u8'


  


  Store the list of m3u8 files generated in list.txt in this format file 'segment-name.m3u8'

  


  for f in 30*.m3u8; do echo "file '$f'" >> list.txt; done


  


  Using concat demuxer, combine all segment files (which are in m3u8 format) and the audio to get one final m3u8 playlist pointing to segments with duration of 10s.

  


  ffmpeg -loglevel error -f concat -i list.txt -i audio.aac -c copy -hls_list_size 0 -hls_time 10 output_30.m3u8


  


  ---

  


  I can change the segment duration in the first step from 30s to 60s, and compare the md5 of the final m3u8 playlist generated in both the cases using this command

  


  ffmpeg -loglevel error -i <input m3u8="m3u8" playlist="playlist" /> -f md5 - &#xA;

  


  The md5 of the output files differ i.e video streams of output_30.m3u8 and output_60.m3u8 are not the same.

  


  Can anyone elaborate on this ?

  


  (I expected the md5 to be the same)

  


• FFMpeg Input link in1:v0 parameters (size > 640x352, SAR 0:1) do not match the corresponding output link in0:v0 > parameters [duplicate]

  25 avril 2020, par Android Developer

  I am using below command to concatenate videos-

  



  String command[] = {"-i",inputFile1AbsolutePath,"-i",inputFile2AbsolutePath .....,"-i",inputFileNAbsolutePath,"-filter_complex","[0:v0] [0:a0] [1:v1] [1:a1]...[N:vN] concat=n=N:v=1:a=1 [v] [a],"-map","[v]","-map","[a]", outputFileAbsolutePath};


  



  and got below error-

  



  


  FAILED with output : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the
 FFmpeg developers
 built with gcc 4.8 (GCC)
 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=
 libavutil 55. 17.103 / 55. 17.103
 libavcodec 57. 24.102 / 57. 24.102
 libavformat 57. 25.100 / 57. 25.100
 libavdevice 57. 0.101 / 57. 0.101
 libavfilter 6. 31.100 / 6. 31.100
 libswscale 4. 0.100 / 4. 0.100
 libswresample 2. 0.101 / 2. 0.101
 libpostproc 54. 0.100 / 54. 0.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
 '/storage/emulated/0/Download/g3cm1tt7qtd41.mp4' :
 Metadata :
 major_brand : iso6
 minor_version : 1
 compatible_brands : mp42iso6avc1isom
 creation_time : 2020-01-30 11:13:07
 Duration : 00:00:00.00, start : 0.042667, bitrate : N/A
 Stream #0:0(und) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p,
 854x480 [SAR 2136:2135 DAR 89:50], 1225 kb/s, 30 fps, 30 tbr, 15360
 tbn, 60 tbc (default)
 Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 128 kb/s (default)
 Input #1, mov,mp4,m4a,3gp,3g2,mj2, from
 '/storage/emulated/0/WhatsApp/Media/WhatsApp
 Video/VID-20200404-WA0000.mp4' :
 Metadata :
 major_brand : mp42
 minor_version : 0
 compatible_brands : mp42isom
 Duration : 00:03:43.14, start : 0.000000, bitrate : 774 kb/s
 Stream #1:0(und) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p,
 640x352, 675 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
 Stream #1:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
 fltp, 96 kb/s (default)
 [Parsed_concat_0 @ 0xb4529400] Input link in1:v0 parameters (size
 640x352, SAR 0:1) do not match the corresponding output link in0:v0
 parameters (854x480, SAR 2136:2135)
 [Parsed_concat_0 @ 0xb4529400] Failed to configure output pad on
 Parsed_concat_0
 Error configuring complex filters.
 Invalid argument

  


  



  Seeing this answer i tried using-

  



  [0:v]setsar=1[v0]; [0:a0] [1:v]setsar=1[v1]; [1:a1]


  



  but did not worked !

  



  How can i resolve this ?