[FFmpeg-trac] #10667(avcodec:new): [Android] MediaCodec h264 encoder cannot output to Matroska container on stdout

[FFmpeg]

#10667: [Android] MediaCodec h264 encoder cannot output to Matroska container on
stdout
-------------------------------------+-------------------------------------
             Reporter:  bubbleguuum  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:
                                     |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Using FFmpeg 6.1 Android custom build.

 Using the MediaCodec h264 encoder for output in a matroska container on
 stdout fails:

 {{{
 ./ffmpeg -hide_banner -i /sdcard/Movies/bigbuckbunny1080p.mp4 -c:v
 h264_mediacodec
 -profile:v high -level 4.1 -b:v 2000k -an -f matroska - > /dev/null
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
 '/sdcard/Movies/bigbuckbunny1080p.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isomavc1
     creation_time   : 2013-03-23T02:39:38.000000Z
     encoder         : HandBrake 0.9.8 2012071800
   Duration: 00:09:56.50, start: 0.000000, bitrate: 4421 kb/s
   Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661),
 yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 4087 kb/s,
 24 fps, 24 tbr, 90k tbn (default)
     Metadata:
       creation_time   : 2013-03-23T02:39:38.000000Z
       vendor_id       : [0][0][0][0]
       encoder         : JVT/AVC Coding
   Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 329 kb/s (default)
     Metadata:
       creation_time   : 2013-03-23T02:39:38.000000Z
       vendor_id       : [0][0][0][0]
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_mediacodec))
 Press [q] to stop, [?] for help
 [h264_mediacodec @ 0xb400007959a1bef0] Use 1 as the default MediaFormat i
 -frame-interval, please set gop_size properly (>= fps)
 [h264_mediacodec @ 0xb400007959a1bef0] Mediacodec encoder doesn't support
 AV_CODEC_FLAG_GLOBAL_HEADER. Use extract_extradata bsf when necessary.
 [out#0/matroska @ 0xb4000078f9a1bfd0] Could not write header (incorrect
 codec parameters ?): Invalid data found when processing input
 Error while filtering: Invalid data found when processing input
 [out#0/matroska @ 0xb4000078f9a1bfd0] Nothing was written into output
 file, because at least one of its streams received no packets.
 frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A
 Conversion failed!

 }}}


 It works fine using libx264 encoder:

 {{{
  ./ffmpeg -i /sdcard/Movies/bigbuckbunny1080p.mp4  -c:v libx264 -preset
 veryfast
 -profile:v high -level 4.1 -b:v 2000k -an -f matroska - > /dev/null
 ...
 output omitted
 ...
 }}}


 It would be great to have it working with h264_mediacodec. Use case is
 generating an in-memory MKV on the fly for live transcoding.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10667>
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