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Why does FFMPEG b-frames and b_pyramid offset start_pts (and start_time) in fragmented output ?

13 juillet 2022, par Vans S
It seems when transcoding something into fragmented or segmented output the start_pts is not 0, and no combination of options can make it 0 other than setting bframes to 0 and bpyramid to 0. This does not happen with regular nonfragmented output.

Does anyone know why this is, and how to prevent it as I believe this is causing weird timesync issues with playback in browsers (every fragment slightly delays the video more and more) where after 2-3 hours the stream can end up 15minutes+ delayed.

Example where each segment start_pts is not 0:
```
ffmpeg -i in.mp4 -pix_fmt yuv420p -an -f yuv4mpegpipe -frames:v 150 - | ffmpeg -f yuv4mpegpipe -i - -y -force_key_frames 1,2,3,4 -map 0 -codec:v libx264 -f segment -segment_list out.csv -segment_times 2,4 -segment_time_delta 0.05 -preset:v fast -segment_format_options movflags=+faststart out%03d.mp4
```
start_pts is 0 here if we add:
```
-x264opts b_pyramid=0 -bf 0 
#or change codec to
-codec:v mpeg4
#or output regular mp4
ffmpeg -i in.mp4 -pix_fmt yuv420p -an -f yuv4mpegpipe -frames:v 150 - | ffmpeg -f yuv4mpegpipe -i - -y out.mp4
```
EDIT: Looking into this further I am starting to think this is a bug with how empty_moov interacts with the negative_cts_offsets flag. (when empty_moov is used, negative_cts_offsets seems to be ignored, and we need empty_moov for full webbrowser support.)
Ffmpeg nvenc encoder on gpu does not compress files as much as compared to libx264

30 mai 2022, par Srinjoy Choudhury
I wanted to encode a video file which was initially encoded by a libx264 encoder on a non gpu machine with ultrafast preset and crf 23 , i typically re-encode it with preset medium and get a good compression but the process is very slow , so i am considering a gpu based solution

my current command to use ffmpeg on a nvidia turing gpu
```
ffmpeg -y -vsync passthrough -hwaccel cuda -i a.mp4 -max_muxing_queue_size 9999 -pix_fmt yuv420p -c:v h264_nvenc -preset medium -tune ll -b:v 4M -bufsize 4M -maxrate 10M -qmin 0 b.mp4
```
usual command i use to do the same
```
ffmpeg -i a.mp4 -max_muxing_queue_size 9999 -pix_fmt yuv420p -c:v libx264 -preset medium b.mp4
enter code here
```
How can i make this command do a better job at reducing file size , i am okay to compromise on the quality of the video for a good reduction in size

Video conversion (using ffmpeg) fails only on apache server

25 avril 2022, par wb.waldemar

I'm trying to convert a video using latest static build of ffmpeg and following command:

ffmpeg -report -y -loglevel info -i en--story-video.mp4 -c:v libx264 -preset slow -crf 22 -c:a copy en--story-video-out.mp4

This works actually fine on Ubuntu (desktop) and the same command works also on Win 10 but not on the server (Debian GNU/Linux 10) where it should actually work. I can't install or build ffmpeg directly so I've to use a static build. Also simple remux works on the server but not the converion and I do not understand why. I've also read and tried different approaches and suggestions, but none of them could solve the problem.

Does someone have an idea what goes wrong?

ffmpeg started on 2022-04-22 at 13:02:44
Report written to "ffmpeg-20220422-130244.log"
Log level: 48
Command line:
/dev/tools/ffmpeg -report -y -loglevel info -i en--story-video.mp4 -c:v libx264 -preset slow -crf 22 -c:a copy en--story-video-out.mp4
ffmpeg version N-60837-ge81242bb13-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
  libavutil      57. 22.100 / 57. 22.100
  libavcodec     59. 21.103 / 59. 21.103
  libavformat    59. 17.102 / 59. 17.102
  libavdevice    59.  5.100 / 59.  5.100
  libavfilter     8. 27.100 /  8. 27.100
  libswscale      6.  5.100 /  6.  5.100
  libswresample   4.  4.100 /  4.  4.100
  libpostproc    56.  4.100 / 56.  4.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'info'.
Reading option '-i' ... matched as input url with argument 'en--story-video.mp4'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'libx264'.
Reading option '-preset' ... matched as AVOption 'preset' with argument 'slow'.
Reading option '-crf' ... matched as AVOption 'crf' with argument '22'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option 'en--story-video-out.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Applying option y (overwrite output files) with argument 1.
Applying option loglevel (set logging level) with argument info.
Successfully parsed a group of options.
Parsing a group of options: input url en--story-video.mp4.
Successfully parsed a group of options.
Opening an input file: en--story-video.mp4.
[NULL @ 0xb9b3b80] Opening 'en--story-video.mp4' for reading
[file @ 0xb9b41c0] Setting default whitelist 'file,crypto,data'
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] ISO: File Type Major Brand: isom
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Processing st: 0, edit list 0 - media time: 512, duration: 522240
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Offset DTS by 512 to make first pts zero.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Setting codecpar->delay to 2 for stream st: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Processing st: 1, edit list 0 - media time: 0, duration: 1502222
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Before avformat_find_stream_info() pos: 15666151 bytes read:88959 seeks:1 nb_streams:2
[h264 @ 0xb9b6380] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0xb9b6380] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0xb9b6380] Format yuv420p chosen by get_format().
[h264 @ 0xb9b6380] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0xb9b6380] no picture 
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] After avformat_find_stream_info() pos: 43534 bytes read:155045 seeks:2 frames:4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'en--story-video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.17.102
  Duration: 00:00:34.06, start: 0.000000, bitrate: 3679 kb/s
  Stream #0:0[0x1](und), 3, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 3544 kb/s, 60 fps, 60 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 04/10/2019.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng), 1, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 04/10/2019.
      vendor_id       : [0][0][0][0]
Successfully opened the file.
Parsing a group of options: output url en--story-video-out.mp4.
Applying option c:v (codec name) with argument libx264.
Applying option c:a (codec name) with argument copy.
Successfully parsed a group of options.
Opening an output file: en--story-video-out.mp4.
[file @ 0xb9fbec0] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
detected 20 logical cores
[h264 @ 0xba04680] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0xba04680] nal_unit_type: 8(PPS), nal_ref_idc: 3
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba04680] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0xba04680] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0xba04680] Format yuv420p chosen by get_format().
[h264 @ 0xba04680] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0xba04680] no picture 
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbaa3b80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[h264 @ 0xbaa3b80] no picture 
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba067c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba9c2c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba21fc0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbab8e80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbac7b00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbad6840] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbae5580] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbaf42c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb03000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb11d40] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb20a80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb2f7c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb3e500] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb4d240] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba04680] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 0xbaa3b80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'pix_fmt' to value '0'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'time_base' to value '1/15360'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'pixel_aspect' to value '1/1'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'frame_rate' to value '60/1'
[graph 0 input from stream 0:0 @ 0xba9f800] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:60/1 sar:1/1
[format @ 0xbaa0540] Setting 'pix_fmts' to value 'yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16|nv21|yuv420p10le|yuv422p10le|yuv444p10le|nv20le|gray|gray10le'
[AVFilterGraph @ 0xba16380] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
[libx264 @ 0xba03c80] using mv_range_thread = 24
[libx264 @ 0xba03c80] using SAR=1/1
[libx264 @ 0xba03c80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[AVIOContext @ 0xb9fba00] Statistics: 0 bytes written, 0 seeks, 0 writeouts
[AVIOContext @ 0xb9b4480] Statistics: 220581 bytes read, 2 seeks
Conversion failed!

Video conversion (using ffmpeg) fails only on server

22 avril 2022, par wb.waldemar

I'm trying to convert a video using latest static build of ffmpeg and following command:

ffmpeg -report -y -loglevel info -i en--story-video.mp4 -c:v libx264 -preset slow -crf 22 -c:a copy en--story-video-out.mp4

Does someone have an idea what goes wrong?

ffmpeg started on 2022-04-22 at 13:02:44
Report written to "ffmpeg-20220422-130244.log"
Log level: 48
Command line:
/dev/tools/ffmpeg -report -y -loglevel info -i en--story-video.mp4 -c:v libx264 -preset slow -crf 22 -c:a copy en--story-video-out.mp4
ffmpeg version N-60837-ge81242bb13-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
  libavutil      57. 22.100 / 57. 22.100
  libavcodec     59. 21.103 / 59. 21.103
  libavformat    59. 17.102 / 59. 17.102
  libavdevice    59.  5.100 / 59.  5.100
  libavfilter     8. 27.100 /  8. 27.100
  libswscale      6.  5.100 /  6.  5.100
  libswresample   4.  4.100 /  4.  4.100
  libpostproc    56.  4.100 / 56.  4.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'info'.
Reading option '-i' ... matched as input url with argument 'en--story-video.mp4'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'libx264'.
Reading option '-preset' ... matched as AVOption 'preset' with argument 'slow'.
Reading option '-crf' ... matched as AVOption 'crf' with argument '22'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option 'en--story-video-out.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Applying option y (overwrite output files) with argument 1.
Applying option loglevel (set logging level) with argument info.
Successfully parsed a group of options.
Parsing a group of options: input url en--story-video.mp4.
Successfully parsed a group of options.
Opening an input file: en--story-video.mp4.
[NULL @ 0xb9b3b80] Opening 'en--story-video.mp4' for reading
[file @ 0xb9b41c0] Setting default whitelist 'file,crypto,data'
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] ISO: File Type Major Brand: isom
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Processing st: 0, edit list 0 - media time: 512, duration: 522240
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Offset DTS by 512 to make first pts zero.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Setting codecpar->delay to 2 for stream st: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Processing st: 1, edit list 0 - media time: 0, duration: 1502222
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] Before avformat_find_stream_info() pos: 15666151 bytes read:88959 seeks:1 nb_streams:2
[h264 @ 0xb9b6380] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0xb9b6380] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0xb9b6380] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0xb9b6380] Format yuv420p chosen by get_format().
[h264 @ 0xb9b6380] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0xb9b6380] no picture 
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb9b3b80] After avformat_find_stream_info() pos: 43534 bytes read:155045 seeks:2 frames:4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'en--story-video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.17.102
  Duration: 00:00:34.06, start: 0.000000, bitrate: 3679 kb/s
  Stream #0:0[0x1](und), 3, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 3544 kb/s, 60 fps, 60 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 04/10/2019.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng), 1, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 04/10/2019.
      vendor_id       : [0][0][0][0]
Successfully opened the file.
Parsing a group of options: output url en--story-video-out.mp4.
Applying option c:v (codec name) with argument libx264.
Applying option c:a (codec name) with argument copy.
Successfully parsed a group of options.
Opening an output file: en--story-video-out.mp4.
[file @ 0xb9fbec0] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
detected 20 logical cores
[h264 @ 0xba04680] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0xba04680] nal_unit_type: 8(PPS), nal_ref_idc: 3
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba04680] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0xba04680] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0xba04680] Format yuv420p chosen by get_format().
[h264 @ 0xba04680] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0xba04680] no picture 
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbaa3b80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[h264 @ 0xbaa3b80] no picture 
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba067c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba9c2c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba21fc0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbab8e80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbac7b00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbad6840] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbae5580] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbaf42c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb03000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb11d40] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb20a80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb2f7c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb3e500] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xbb4d240] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0xba04680] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 0xbaa3b80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'pix_fmt' to value '0'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'time_base' to value '1/15360'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'pixel_aspect' to value '1/1'
[graph 0 input from stream 0:0 @ 0xba9f800] Setting 'frame_rate' to value '60/1'
[graph 0 input from stream 0:0 @ 0xba9f800] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:60/1 sar:1/1
[format @ 0xbaa0540] Setting 'pix_fmts' to value 'yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16|nv21|yuv420p10le|yuv422p10le|yuv444p10le|nv20le|gray|gray10le'
[AVFilterGraph @ 0xba16380] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
[libx264 @ 0xba03c80] using mv_range_thread = 24
[libx264 @ 0xba03c80] using SAR=1/1
[libx264 @ 0xba03c80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[AVIOContext @ 0xb9fba00] Statistics: 0 bytes written, 0 seeks, 0 writeouts
[AVIOContext @ 0xb9b4480] Statistics: 220581 bytes read, 2 seeks
Conversion failed!

VLC huge buffering times over rtp for local H264 stream

15 mars 2022, par mike

I'm outputting an H264 stream, encoded by my application using ffmpeg. I can display it using ffplay, but when trying to view the stream in VLC, I only get the first frame, or it looks like that's the case.

The messages output shows that it is "buffering", taking around a minute to get to 100% when the frame updates. When using ffplay, the latency is about 50-100ms at worst.

I am sending to rtp://127.0.0.1:6666?pkt_size=1316 with the format rtp_mpegts. I am new to this and it's highly likely I haven't set the frame up completely correctly. The process is (minus declarations and error checking)

codec_name = "libx264";
codec = avcodec_find_encoder_by_name(codec_name.c_str());
context = avcodec_alloc_context3(codec);
pkt = av_packet_alloc();
context->bit_rate = 5 * Mega;
context->width = info.DisplayWidth;
context->height = info.DisplayHeight;
context->time_base = { 1, FPS };
context->framerate = { FPS, 1 };
context->gop_size = 100;
context->max_b_frames = 1;            
context->pix_fmt = AV_PIX_FMT_YUV420P;
if (codec->id == AV_CODEC_ID_H264)
            {
                check_ret("set option: preset", av_opt_set(context->priv_data, "preset", "fast", 0));
                check_ret("set option: tune", av_opt_set(context->priv_data, "tune", "zerolatency", 0));
                check_ret("set option: profile", av_opt_set(context->priv_data, "profile", "baseline", 0));                
            }
check_ret("open codec", avcodec_open2(context, codec, NULL));

// setup the stream 
fmt = (AVOutputFormat*)av_guess_format("rtp_mpegts", NULL, NULL);

avformat_alloc_output_context2(&avfctx, fmt, fmt->name,
            "rtp://127.0.0.1:6666?pkt_size=1316"); 
        
avio_open(&avfctx->pb, avfctx->url, AVIO_FLAG_WRITE);
AVStream* stream = avformat_new_stream(avfctx, codec);
avcodec_parameters_from_context(stream->codecpar, context);
stream->time_base.num = 1;
stream->time_base.den = FPS;
avformat_write_header(avfctx, NULL);

// then the encoding (in an output loop)

yuvFrame->pts = i++; // i is incremented every frame
avcodec_send_frame(enc_ctx, yuvFrame);
 while (ret >= 0) {
  ret = avcodec_receive_packet(enc_ctx, pkt);          
  //ret = av_interleaved_write_frame(avfctx, pkt); was using this, don't seem to need it
  ret = av_write_frame(avfctx, pkt);
  av_packet_unref(pkt);
}

The VLC output looks like this:

main debug: using hw decoder module "d3d11va"
avcodec info: Using D3D11VA (NVIDIA GeForce RTX 2080 Super with Max-Q Design, vendor 10de(NVIDIA), device 1e93, revision a1) for hardware decoding
qt debug: Logical video size: 1280x720
main debug: resized to 1280x720
main debug: VoutDisplayEvent 'resize' 1280x720
main debug: Received first picture
main debug: Buffering 1%
main debug: Buffering 2%
main debug: Buffering 3%
main debug: auto hiding mouse cursor
main debug: Buffering 4%
main debug: Buffering 5%
main debug: Buffering 6%
main debug: Buffering 7%
main debug: Buffering 8%
main debug: Buffering 9%
main debug: Buffering 10%
main debug: auto hiding mouse cursor
main debug: Buffering 11%
rtp warning: 1 packet(s) lost
rtp warning: 1 packet(s) lost
rtp warning: 1 packet(s) lost
ts warning: discontinuity received 0x3 instead of 0xd (pid=256)
ts warning: discontinuity received 0x5 instead of 0xf (pid=256)
ts warning: discontinuity received 0x1 instead of 0xb (pid=256)
main debug: Buffering 12%
main debug: Buffering 13%
main debug: Buffering 14%
main debug: Buffering 15%
main debug: Buffering 16%
main debug: Buffering 17%
main debug: Buffering 18%
main debug: auto hiding mouse cursor
main debug: Buffering 19%
main debug: Buffering 20%

1 | ... | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | ... | 88

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