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• Ffmpeg inaccurate cut duration with ts [duplicate]

  30 juillet 2020, par Lemon Sky

  I need to accurately seek and cut a video. Some online sources say put -ss in front or after the source. The result is the same for me. In the examples below, the start time is accurate but the duration is not accurate.

  


  ffmpeg -y -ss 00:00:05 -t 00:00:05 -i http://tyberis.com/output.ts 5s.wav
ffprobe 5s.wav

Duration: 00:00:04.74

ffmpeg -y -i http://tyberis.com/output.ts -ss 00:00:05 -t 00:00:05 5s.wav
ffprobe 5s.wav

Duration: 00:00:04.74


  


  Sometimes the starting point is not accurate but the duration is. This is clearly audible by cutting the ts file and cutting an uncompressed wav file, and listening to both.

  


  ffmpeg -y -i http://tyberis.com/output.ts -ss 00:00:15 -t 00:00:05 5s.wav

ffmpeg -y -i http://tyberis.com/output.wav -ss 00:00:15 -t 00:00:05 5s-reference.wav


  


  What fixes the starting time is if I use an m3u8 file that contains the byte offset for every keyframe AND I put the -ss option in front of the source file (if I put it after the source, the start time is inaccurate but the duration is accurate) :

  


  ffmpeg -y -ss 00:00:15 -t 00:00:05 -i http://tyberis.com/output.m3u8 5s.wav


  


  This fixes the start time but the duration is at the location that I would get had I used no m3u8 file (duration is just 4.47s).

  


  It seems different timestamps are involved, and sometimes one or the other gets used.

  


  The ts file was generated by capturing a UDP stream and storing it with ffmpeg and -codec:v copy.

  


  Is ffmpeg broken, or the ts file ? How do I work around this issue or fix the ts file ? What I realize is that the video starts later than the audio, probably because the video does not start with a keyframe. Can I get ffmpeg to start the -codec:v copy after the first keyframe ? What I also notice is that using ffprobe reports "start : 1.400000". Can I force it to start at 0 ?

  


  Any hints would be appreciated.

  


  I tried both ffmpeg 4.3.1 and ffmpeg git-2020-07-24-21442a8.

  


• ffmpeg : LIVE HLS Playback getting delayed over time

  31 juillet 2020, par Krishnakumar

  We are converting UDP Input to Live HLS output and pushing the chunks to a webdav server. Initial playback works fine, But the playback was delayed by almost an hour, when we checked after 15 hours. Not sure this is caused due to network as we use internet to push the chunks. Below is the ffmpeg command used.

  


  ffmpeg -i udp://230.1.1.15:10000?fifo_size=10000000&overrun_nonfatal=1 -filter_complex [i:0xd49]yadif,setdar=256/144[v0];[i:0xd49]yadif,setdar=512/288[v1];[i:0xd49]yadif,setdar=640/360[v2];[i:0xd49]yadif,setdar=1280/720[v3] -f hls -map i:0xd4a -af aresample=async=1:min_hard_comp=0.100000:first_pts=0 -c:a:0 libfdk_aac -b:a:0 48000 -ar:0 48000 -map [v0] -b:v:0 100000 -maxrate:v:0 100000 -minrate:v:0 100000 -bufsize:v:0 200000 -s:v:0 256x144 -r:0 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:0 libx264 -profile:v:0 baseline -level:v:0 3.0 -preset:v:0 fast -nal-hrd cbr -g 50 -map i:0xd4a -af aresample=async=1:min_hard_comp=0.100000:first_pts=0 -c:a:1 libfdk_aac -b:a:1 48000 -ar:1 48000 -map [v1] -b:v:1 200000 -maxrate:v:1 200000 -minrate:v:1 200000 -bufsize:v:1 400000 -s:v:1 512x288 -r:1 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:1 libx264 -profile:v:1 baseline -level:v:1 3.0 -preset:v:1 fast -nal-hrd cbr -g 50 -map i:0xd4a -af aresample=async=1:min_hard_comp=0.100000:first_pts=0 -c:a:2 libfdk_aac -b:a:2 64000 -ar:2 48000 -map [v2] -b:v:2 700000 -maxrate:v:2 700000 -minrate:v:2 700000 -bufsize:v:2 1400000 -s:v:2 640x360 -r:2 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:2 libx264 -profile:v:2 baseline -level:v:2 3.0 -preset:v:2 fast -nal-hrd cbr -g 50 -map i:0xd4a -af aresample=async=1:min_hard_comp=0.100000:first_pts=0 -c:a:3 libfdk_aac -b:a:3 64000 -ar:3 48000 -map [v3] -b:v:3 1000000 -maxrate:v:3 1000000 -minrate:v:3 1000000 -bufsize:v:3 2000000 -s:v:3 1280x720 -r:3 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:3 libx264 -profile:v:3 high -level:v:3 4.0 -preset:v:3 fast -nal-hrd cbr -g 50 -var_stream_map a:0,v:0,name:148k a:1,v:1,name:248k a:2,v:2,name:764k a:3,v:3,name:1064k -master_pl_name master.m3u8 -hls_list_size 3 -hls_time 6 -hls_segment_filename https://usr:pass@example.com:8043/httppush/media_%v_%03d.ts -hls_flags delete_segments+independent_segments+discont_start https://usr:pass@example.com:8043/httppush/playlist_%v.m3u8


  


  FFMPEG V4.3

  


  ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
  configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --extra-libs=-lpthread --extra-libs=-lm --bindir=/root/bin --enable-gpl --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree --enable-openssl
  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
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100


  


  With Split Filter :

  


  ffmpeg -i "udp://230.1.1.15:10000?fifo_size=10000000&overrun_nonfatal=1" -filter_complex "[i:0xd49]yadif[v];[v]split=4[1out1][1out2][1out3][1out4];[1out1]setdar=256/144[v0];[1out2]setdar=512/288[v1];[1out3]setdar=640/360[v2];[1out4]setdar=1280/720[v3];[i:0xd4a]aresample=async=1:min_hard_comp=0.100000:first_pts=0[a];[a]asplit=4[a0][a1][a2][a3]" -f hls -map [a0] -c:a:0 libfdk_aac -b:a:0 48000 -ar:0 48000 -map [v0] -b:v:0 100000 -maxrate:v:0 100000 -minrate:v:0 100000 -bufsize:v:0 200000 -s:v:0 256x144 -r:0 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:0 libx264 -profile:v:0 baseline -level:v:0 3.0 -preset:v:0 fast -nal-hrd cbr -g 50 -map [a1] -c:a:1 libfdk_aac -b:a:1 48000 -ar:1 48000 -map [v1] -b:v:1 200000 -maxrate:v:1 200000 -minrate:v:1 200000 -bufsize:v:1 400000 -s:v:1 512x288 -r:1 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:1 libx264 -profile:v:1 baseline -level:v:1 3.0 -preset:v:1 fast -nal-hrd cbr -g 50 -map [a2] -c:a:2 libfdk_aac -b:a:2 64000 -ar:2 48000 -map [v2] -b:v:2 700000 -maxrate:v:2 700000 -minrate:v:2 700000 -bufsize:v:2 1400000 -s:v:2 640x360 -r:2 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:2 libx264 -profile:v:2 baseline -level:v:2 3.0 -preset:v:2 fast -nal-hrd cbr -g 50 -map [a3] -c:a:3 libfdk_aac -b:a:3 64000 -ar:3 48000 -map [v3] -b:v:3 1000000 -maxrate:v:3 1000000 -minrate:v:3 1000000 -bufsize:v:3 2000000 -s:v:3 1280x720 -r:3 25 -sc_threshold 0 -pix_fmt yuv420p -flags +global_header+cgop -c:v:3 libx264 -profile:v:3 high -level:v:3 4.0 -preset:v:3 fast -nal-hrd cbr -g 50 -var_stream_map "a:0,v:0,name:148k a:1,v:1,name:248k a:2,v:2,name:764k a:3,v:3,name:1064k" -master_pl_name master.m3u8 -hls_list_size 3 -hls_time 6 -hls_segment_filename https://usr:pass@example.com:8043/httppush/media_%v_%03d.ts -hls_flags delete_segments+independent_segments+discont_start https://usr:pass@example.com:8043/httppush/playlist_%v.m3u8


  


• Ffmpeg invalid data when trying to merge videos

  30 juillet 2020, par Luka Milivojevic

  I have a below function for merging videos in Python without re-encoding using FFmpeg :

  


  def merge():
    """
    This function merges a group of videos into one long video.
    It is used for merging parts that are cut from original video into a new one.
    The videos are merged using ffmpeg and for the ffmpeg
    to use the concat method on them, the video names must be put inside
    the vidlist.txt file.
    New video is saved to the file named output.mp4.
    """
    command = "ffmpeg -hide_banner -loglevel error -f concat -safe 0 -i vidlist.txt -c copy output.mp4"
    # merge multiple parts of the video
    subprocess.call(command, shell=True)


  


  I store paths to videos to be merged inside a vidlist.txt file which looks like :

  


  file 'out11.mp4'
file 'out21.mp4'


  


  But, I am getting the following error :

  


  vidlist.txt: Invalid data found when processing input


  


  Here is the report file :

  


  ffmpeg started on 2020-07-30 at 20:23:53
Report written to "ffmpeg-20200730-202353.log"
Log level: 48
Command line:
ffmpeg -hide_banner -f concat -safe 0 -i "C:\\Users\\miliv\\videocutter\\utils\\vidlist.txt" -c copy output.mp4 -report
Splitting the commandline.
Reading option '-hide_banner' ... matched as option 'hide_banner' (do not show program banner) with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'concat'.
Reading option '-safe' ... matched as AVOption 'safe' with argument '0'.
Reading option '-i' ... matched as input url with argument 'C:\Users\miliv\videocutter\utils\vidlist.txt'.
Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option 'output.mp4' ... matched as output url.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option hide_banner (do not show program banner) with argument 1.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url C:\Users\miliv\videocutter\utils\vidlist.txt.
Applying option f (force format) with argument concat.
Successfully parsed a group of options.
Opening an input file: C:\Users\miliv\videocutter\utils\vidlist.txt.
[concat @ 000001aaafb8e400] Opening 'C:\Users\miliv\videocutter\utils\vidlist.txt' for reading
[file @ 000001aaafb8f500] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000001aaafb97700] Statistics: 0 bytes read, 0 seeks
C:\Users\miliv\videocutter\utils\vidlist.txt: Invalid data found when processing input