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• How to split and scale streams in ffmpeg with cuda ?

  30 décembre 2020, par Samyak

  So, I want to create streams of multiple resolutions for hls streaming. Here's what I've tried so far :

  


  ffmpeg -vsync 0 -hwaccel cuvid -i input.mkv -c:a aac -c:v h264_nvenc \
-c:s webvtt -crf 20 -filter_complex \
'[v:0]hwupload_cuda,split=2[vtemp001][vout002]:[vtemp001]hwupload_cuda,scale_npp=w=960:h=540:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p[vout001]'  \
-map "[vout001]" -b:v:0 2000k -map "[vout002]" \
-b:v:1 6000k -map 0:v -map 0:a -map 0:s -map 0:v \ 
-map 0:a -map 0:s -var_stream_map 'v:0,a:0,s:0 v:1,a:1,s:1' \ 
-force_key_frames:v "expr:gte(t,n_forced*2.000)" -hls_time 6 -hls_playlist_type event -hls_flags \
delete_segments+independent_segments+discont_start+program_date_time \
-master_pl_name master.m3u8 -hls_segment_filename \
fire/segment_%v/file%06d.ts fire/stream_%v.m3u8


  


  Running this, I am getting the following error :

  


  Impossible to convert between the formats supported by the filter 
'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  


  When I do the same thing without gpu, I am getting an out of memory error which to me sounds like I can't do this without a gpu (i.e I have to run separate ffmpeg commands to get this to run on the CPU). Would love to know if anyone has any insights or suggestions.

  


  I tried something more easy to understand here :

  


  ffmpeg -vsync 0 -hwaccel cuvid -i input.mkv -c:v h264_nvenc -filter_complex \
'[v:0]hwupload_cuda,split=2[vtemp001][vout002];[vtemp001]hwupload_cuda,scale_npp=w=960:h=540:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p[vout001]' \
-map "[vout001]" -b:v:0 2000k output1.mkv -map "[vout002]" -b:v:1 6000k output2.mkv


  


  The above gives the same error which to me suggests that the issue is with the filter complex.

  


• avcodec/evc_parse : Check tid

  4 octobre 2023, par Michael Niedermayer

  avcodec/evc_parse : Check tid
  The check is based on not infinite looping. It is likely
  
  a more strict check can be done
  Fixes : Infinite loop
  
  Fixes : 62473/clusterfuzz-testcase-minimized-ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
  
  Fixes : 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-6448531252314112
  
  Fixes : 63378/clusterfuzz-testcase-minimized-ffmpeg_dem_MPEGPS_fuzzer-6504993844494336
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Reviewed-by : "Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics" <d.kozinski@samsung.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/evc_parse.c

• ffmpeg's invalid input stream fps causes low latency [closed]

  9 mai 2024, par I have 10 fingers

  I have ffmpeg setup which produces rtmp stream from remote rtsp stream. The rtsp stream comes from ip camera which support multiple profiles. Each profile has 1080p 30 fps, 1080p 15 fps.

  


  The weird thing is that when ffmpeg analyze its input stream, one profile is recognized as 1 fps as below

  


  Input #0, rtsp, from 'rtsp://...':
  Metadata:
    title           : Media Presentation
    comment         : samsung
  Duration: N/A, start: 0.064144, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1 fps, 1 tbr, 90k tbn, 2 tbc
    Stream #0:1: Data: none
Output #0, flv, to 'rtmp:...':
  Metadata:
    title           : Media Presentation
    comment         : samsung
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 1 fps, 1 tbr, 1k tbn, 90k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)


  


  And when it is played the tbr is 30 i think it means the real fps from video stream is 30. No problem actually this gives me the lowest latency(2-3s).

  


  The other stream is normal 30 fps input 30 fps output and it gives me some delay(5-6s) so i want to know what cause this fps bug ? If i can use this bug i want to change all my streams to reduce the latency.