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• avcodec/nellymoserdec : Make decoder init-threadsafe

  22 novembre 2020, par Andreas Rheinhardt

  avcodec/nellymoserdec : Make decoder init-threadsafe
  Easy now that initializing the ff_sine_* tables is thread-safe.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/nellymoserdec.c

• m3u8 playback issue with VLC player and ffmpeg [closed]

  2 avril, par YUZ

  I’m creating a timelapse video from a folder of images using FFmpeg, generating two HLS (m3u8) playlists : one at 1080p and another at 2K resolution. The playlists and .ts segments appear to be generated correctly, but when I play the m3u8 files in media players like VLC or PotPlayer, the video does not play seamlessly. Instead, it plays in a segment-by-segment manner (e.g., it stops after each segment and doesn’t automatically continue to the next one). I expect the entire video to play continuously without interruptions. What could be the issue ?

  


  I ran these commands on cmd :

  


  for %i in (*.jpeg) do echo file '%cd%\%i' >> C:\Users\stitch_img\test\input_list.txt

ffmpeg -y -f concat -safe 0 -i "C:\Users\stitch_img\test\input_list.txt" -vf "scale=1920x1080" -c:v libx264 -r 16 -hls_time 4 -hls_playlist_type vod -hls_segment_filename "C:\Users\stitch_img\test\1080_video_%03d.ts" "C:\Users\stitch_img\test\1080_playlist.m3u8"

ffmpeg -y -f concat -safe 0 -i "C:\Users\stitch_img\test\input_list.txt" -vf 
"scale=2560x1440" -c:v libx264 -r 16 -hls_time 4 -hls_playlist_type vod -hls_segment_filename "C:\Users\stitch_img\test\2k_video_%03d.ts" "C:\Users\stitch_img\test\2k_playlist.m3u8"

echo #EXTM3U > "C:\Users\stitch_img\test\master_playlist.m3u8"
echo #EXT-X-STREAM-INF:BANDWIDTH=5000000,RESOLUTION=1920x1080 >> "C:\Users\stitch_img\test\master_playlist.m3u8"
echo 1080_playlist.m3u8 >> "C:\Users\stitch_img\test\master_playlist.m3u8"
echo #EXT-X-STREAM-INF:BANDWIDTH=8000000,RESOLUTION=2560x1440 >> "C:\Users\stitch_img\test\master_playlist.m3u8"
echo 2k_playlist.m3u8 >> "C:\Users\stitch_img\test\master_playlist.m3u8"


  


  What I’ve Tried :

  


  


  • Verified that the .ts files are playable individually (e.g., opening 1080p_000.ts in VLC works fine).

    


  


  • Ensured the m3u8 files are structured correctly with #EXT-X-ENDLIST (indicating a VOD playlist).

    


  


  • Used HTTP playback to rule out local path resolution issues, but the issue persists

    


  


  


  m3u8 masters :

  


  #EXTM3U
#EXT-X-STREAM-INF: BANDWIDTH=5000000, RESOLUTION=1920x1080 1080_playlist.m3u8
#EXT-X-STREAM-INF: BANDWIDTH=8000000, RESOLUTION=2560x1440 2k_playlist.m3u8


  


  m3u8_2k :

  


  #EXTM3U
#EXT-X-VERSION: 3
#EXT-X-TARGETDURATION: 4 
#EXT-X-MEDIA-SEQUENCE:0 
#EXT-X-PLAYLIST-TYPE: VOD
#EXTINF: 4.125000, 
2k_video_000.ts 
#EXTINF:3.312500,
2k_video_001.ts
#EXT-X-ENDLIST


  


  m3u8_1080p :

  


  #EXTM3U
#EXT-X-VERSION: 3
#EXT-X-TARGETDURATION: 4 
#EXT-X-MEDIA-SEQUENCE:0 
#EXT-X-PLAYLIST-TYPE: VOD
#EXTINF: 4.125000, 
1080_video_000.ts 
#EXTINF:3.312500,
1080_video_001.ts
#EXT-X-ENDLIST


  


• How to FFmpeg decode and extract metadata from last frame ?

  15 août 2016, par Girls.Gone.Wired

  I am decoding using FFMpeg. The videos I am decoding are H.264 or MPEG4 videos using C code. I am using the 32bit libs. I have successfully decoded and extracted the metadata for the first frame. I would now like to decode the last frame. I have a defined duration of the video, and felt it was a safe assumption to say that isLastFrame = duration. Here’s what I have, any suggestions ?

  AVFormatContext* pFormatCtx = avformat_alloc_context();
  
  avformat_open_input(&pFormatCtx, filename, NULL, NULL);
  
  int64_t duration = pFormatCtx->duration;
  
  i=0;
  
  while(av_read_frame(pFormatCtx, &packet)>=0) {
  
     /* Is this a packet from the video stream? */
  
     if(packet.stream_index==videoStream) {
  
     /* Decode video frame*/
  
        avcodec_decode_video2(pCodecCtx, pFrame, &duration, &packet);
  
      }

  Any help is much appreciated ! :)