“ffmpeg -i input -pix_fmt bgr24 -c:v rawvideo output.avi”: “par->codec_tag” is set to “0”

[Kdmeizk]

​libavformat/mux.c:

            if (   par->codec_tag
                && par->codec_id == AV_CODEC_ID_RAWVIDEO
                && (   av_codec_get_tag(of->codec_tag, par->codec_id) == 0
                    || av_codec_get_tag(of->codec_tag, par->codec_id) == MKTAG('r', 'a', 'w', ' '))
                && !validate_codec_tag(s, st)) {
                // the current rawvideo encoding system ends up setting
                // the wrong codec_tag for avi/mov, we override it here
                par->codec_tag = 0;
            }

[Kdmeizk]

Input file:
​https://drive.google.com/file/d/0B40VEgqICZzWZ1UwQ2M5VldvNmM/view?usp=sharing

ffmpeg-20191126-59d264b-win64-static\bin\ffmpeg.exe -i 00006.m2ts -to 00:00:05 -pix_fmt bgr24 -c:v rawvideo -an output.avi
ffmpeg version git-2019-11-26-59d264b Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20191125
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 36.100 / 56. 36.100
  libavcodec     58. 62.100 / 58. 62.100
  libavformat    58. 35.100 / 58. 35.100
  libavdevice    58.  9.101 / 58.  9.101
  libavfilter     7. 67.100 /  7. 67.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mpegts, from '00006.m2ts':
  Duration: 00:00:44.05, start: 1.992667, bitrate: 36799 kb/s
  Program 1 
    Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
    Stream #0:1[0x1100]: Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, 5.1(side), s32p (24 bit)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, avi, to 'output.avi':
  Metadata:
    ISFT            : Lavf58.35.100
    Stream #0:0: Video: rawvideo, bgr24, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 1193200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc
    Metadata:
      encoder         : Lavc58.62.100 rawvideo
video:729000kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001158%

ffmpeg-20191126-59d264b-win64-static\bin\ffprobe.exe -show_streams output.avi
ffprobe version git-2019-11-26-59d264b Copyright (c) 2007-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20191125
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 36.100 / 56. 36.100
  libavcodec     58. 62.100 / 58. 62.100
  libavformat    58. 35.100 / 58. 35.100
  libavdevice    58.  9.101 / 58.  9.101
  libavfilter     7. 67.100 /  7. 67.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, avi, from 'output.avi':
  Metadata:
    encoder         : Lavf58.35.100
  Duration: 00:00:05.01, start: 0.000000, bitrate: 1193214 kb/s
    Stream #0:0: Video: rawvideo, bgr24, 1920x1080, 1203227 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
[STREAM]
index=0
codec_name=rawvideo
codec_long_name=raw video
profile=unknown
codec_type=video
codec_time_base=1001/24000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=bgr24
level=-99
color_range=unknown
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=unspecified
field_order=unknown
timecode=N/A
refs=1
id=N/A
r_frame_rate=24000/1001
avg_frame_rate=24000/1001
time_base=1001/24000
start_pts=0
start_time=0.000000
duration_ts=120
duration=5.005000
bit_rate=1203227294
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=120
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
[/STREAM]

[Carl Eugen Hoyos]

Please post all usage questions on the user mailing list, this is a bug tracker.

[Kdmeizk]

I understand that “par->codec_tag” is set to “0” because FFmpeg’s “rawvideo encoding system” is problematic.
So the ticket should be valid.

[Carl Eugen Hoyos]

Replying to Kdmeizk:

I understand that “par->codec_tag” is set to “0” because FFmpeg’s “rawvideo encoding system” is problematic.

No, the reason is the avi specification.

[Kdmeizk]

Replying to cehoyos:

Replying to Kdmeizk:

I understand that “par->codec_tag” is set to “0” because FFmpeg’s “rawvideo encoding system” is problematic.

No, the reason is the avi specification.

Thank you for your reply.
So the ticket is invalid.