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• Video converted with FFMPEG cannot be played

  20 mai 2023, par EugeneH

  I am developing a function that converts RTSP files to HLS and displays them in a web browser (chrome).
Development is node.js, I am using ffmpeg.

  


  The part that is converted to HLS and displayed on the screen plays well without any problems.
Video cannot be played the moment the folder is changed for file management.

  


  This is the existing working ffmpeg code and m3u8 code.

  


   ffmpeg -rtsp_transport tcp -i rtsp://210.99.70.120:1935/live/cctv001.stream -c:v copy -f hls -hls_time 1 -hls_segment_type mpegts -hls_flags delete_segments+independent_segments+omit_endlist -hls_list_size 0 -master_pl_name playlist.m3u8 -hls_segment_filename /Users/name/Movies/cam/1/hls/1684560902700_%06d.ts -var_stream_map v:0 /Users/name/Movies/cam/1/hls/1684560902700_playlist.m3u8

Local Path : /Users/name/Movies/cam/1/hls/1684560902700_playlist.m3u8
EndPoint : http://localhost:3000/video/cam/1/hls/1684560902700_playlist.m3u8
 #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-INDEPENDENT-SEGMENTS
#EXTINF:2.000000,
1684560902700_000000.ts
#EXTINF:1.969000,
1684560902700_000001.ts
#EXTINF:2.000000,
1684560902700_000002.ts
#EXTINF:2.015000,
1684560902700_000003.ts


  


  This is the ffmpeg code and the m3u8 code with the path added.(Video not played)

  


  ffmpeg -rtsp_transport tcp -i rtsp://210.99.70.120:1935/live/cctv001.stream -c:v copy -f hls -hls_time 1 -hls_segment_type mpegts -hls_flags delete_segments+independent_segments+omit_endlist -hls_list_size 0 -master_pl_name playlist.m3u8 -hls_segment_filename /Users/name/Movies/cam/1/hls/1684561736286/cam_%06d.ts -var_stream_map v:0 /Users/name/Movies/cam/1/hls/1684561736286/playlist.m3u8

Local Path : /Users/name/Movies/cam/1/hls/1684561736286/playlist.m3u8
EndPoint : http://localhost:3000/video/cam/1/hls/1684561736286/playlist.m3u8
#EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-INDEPENDENT-SEGMENTS
#EXTINF:1.986000,
cam_000000.ts
#EXTINF:1.984000,
cam_000001.ts
#EXTINF:2.000000,
cam_000002.ts
#EXTINF:2.000000,
cam_000003.ts


  


  The difference is the file name and the folder created one step further.

  


  If you change POSIX from file name to folder name, you will not know the problem of not playing the video.
Can someone please explain this ?

  


• ffmpeg Muxing Recovered Files - Audio dropping

  7 avril 2020, par Chris McL

  A few years ago, we accidentally deleted all our home movies. We recovered the files from the camera. They have lost their headers and are not playable. I have used a recovery program (recover_mp4) to get an h264 and aac file.

  



  When I try to mux these together, the audio drops off from the stream. It also crackles badly at times. If I play the AAC file by itself, it sounds fine. For some movies, the audio works for a while, on others it drops out quickly.

  



  One thing I noticed is that the resulting muxed mp4 file is often shorter than the audio.

  



  I've tried various ffmpeg commands that look generally like this :

  



  ffmpeg -r 30000/1001 -i recovered_video.h264 -i recovered_audio -bsf:a aac_adtstoasc -c:v copy -c:a copy output.mp4

  



  Any ideas on how to marry the two files together ?

  


• ffmpeg start_time is negative

  7 septembre 2017, par Alex Bollbach

  I’m using ffmpeg to segment a video by start/end times. For example, I have a set of time [1], and I’d call ffmpeg 3 times here to create the three 2 second videos at times 0, 2, and 4.

  My problem is that these times (which are correct) are not correctly segmenting the video. When I inspect the stats of the video with ffprobe -i test.mov -show_format, I noticed start_time=-0.381044. I also know that this seems to be caused by trimming a video in QuickTime to produce this video. In order to correct this, I must add (start + 0.381044) somewhere in my code, and the output is fine.

  So, why is the start_time set to a negative value by the quicktime trimming ? How can I set start_time=0, so my code can work without the + 0.381044 ?