[FFmpeg-devel] [PATCH 01/35] fftools/ffmpeg_mux: add private muxer context

[Michael Niedermayer]

On Fri, Jun 17, 2022 at 12:27:18PM +0200, Anton Khirnov wrote:
> The current version of this set can also be found in my tree
> git://git.khirnov.net/libav
> branch ffmpeg_mt/mux

There are really many files changing, its hard to say for sure that all are the
same issue, but basically it all seems more or less frames in some streams
including cases where there are hugely more or 0

Here are some examples:


ffmpeg -i matrixbench_mpeg2.mpg -vcodec rawvideo -pix_fmt rgb555 -allow_raw_vfw 1 -vframes 1 -bitexact file-rgb555.mkv

the new file is much bigger (due to the audio track)

-rw-r----- 1 michael michael 2765813 Jul  8 16:57 file-rgb555.mkv
-rw-r----- 1 michael michael  834643 Jul  8 17:02 file-rgb555-ref.mkv


another one:
./ffmpeg -y -i vlcticket/8344/DVR_NVR_IP\ Camera01_20130321162325_20130321162358_576877.mp4 -vframes 1 -aframes 1 -bitexact -f framecrc -

This appears to loose the video stream

 #channel_layout_name 1: mono
-0,          0,          0,        1,  2880000, 0x4136bc92
 1,        112,        112,      320,      640, 0x2cd73b36

sample in https://samples.ffmpeg.org/camera-dvr/hikvision/
 
 
 
This one fails a bit worse than before (ffmpeg succeeds before besides producing errors as well)
my notes say this worked better only before 04aa09c4bcf2d5a634a35da3a3ae3fc1abe30ef8
the file is a little big and i havnt found it anywhere online, i will try to
send it privately to you
 
ffmpeg -i 2014-10-17\ 11.31\ i95Dev\ -\ Carlo\ Pazolini\ _\ KWI\ -\ Meeting.g2m -bitexact -max_muxing_queue_size 8000 -vframes 2 file-g2m5.avi

  Metadata:
    DeviceConformanceTemplate: L2
    WMFSDKNeeded    : 0.0.0.0000
    WMFSDKVersion   : 12.0.7601.17514
    IsVBR           : 1
    WM/ToolVersion  : 6.4.3 Build 1767
    WM/ToolName     : GoToMeeting
    BitRateFrom the writer: 97087
    Audio samples   : 34341
    Video samples   : 3740
    recording time  : Fri, 17 Oct 2014 12:28:16 Eastern Daylight Time
  Duration: 00:57:13.86, start: 0.000000, bitrate: 100 kb/s
  Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, mono, fltp, 48 kb/s
  Stream #0:1: Data: none, 2 kb/s
  Stream #0:2: Video: g2m (G2M5 / 0x354D3247), rgb24, 1440x900, 49 kb/s, 1k tbr, 1k tbn
Stream mapping:
  Stream #0:2 -> #0:0 (g2m (native) -> mpeg4 (native))
  Stream #0:0 -> #0:1 (wmav2 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
[libmp3lame @ 0x55c17cf03140] Queue input is backward in time
Output #0, avi, to 'file-g2m5.avi':
  Metadata:
    DeviceConformanceTemplate: L2
    WMFSDKNeeded    : 0.0.0.0000
    WMFSDKVersion   : 12.0.7601.17514
    IsVBR           : 1
    WM/ToolVersion  : 6.4.3 Build 1767
    WM/ToolName     : GoToMeeting
    BitRateFrom the writer: 97087
    Audio samples   : 34341
    Video samples   : 3740
    recording time  : Fri, 17 Oct 2014 12:28:16 Eastern Daylight Time
  Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p(tv, progressive), 1440x900, q=2-31, 200 kb/s, 1k fps, 1k tbn
    Metadata:
      encoder         : Lavc mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, mono, fltp
    Metadata:
      encoder         : Lavc libmp3lame
[avi @ 0x55c17cf31340] Too large number of skipped frames 194184 > 600000kbits/s speed= 140x    
av_interleaved_write_frame(): Invalid argument
Error muxing a packet for output file #0
[avi @ 0x55c17cf31340] Too large number of skipped frames 194085 > 60000
frame=    2 fps=1.3 q=2.0 Lsize=    1855kB time=00:03:14.18 bitrate=  78.3kbits/s speed= 129x    
video:149kB audio:1517kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.381945%
Conversion failed!



./ffmpeg -i tickets/1666/avc-intra-panasonic-AG-HPX301E.mov     -vframes 3 -aframes 2 -bitexact -f framecrc -
duplicate behavior of the a/vframe issue above, one stream disappears

sample in https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket1666/



[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Any man who breaks a law that conscience tells him is unjust and willingly 
accepts the penalty by staying in jail in order to arouse the conscience of 
the community on the injustice of the law is at that moment expressing the 
very highest respect for law. - Martin Luther King Jr
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