Briefing
I have some .wmv files (actually, my full batch file deals with multiple filetypes) with weird data streams that are needed for an external program to recognize them.
I'm trying to remove every stream that is not data or audio, which also needs to be reencoded.
My current command is
fmpeg -y -loglevel debug -flags global_header -err_detect ignore_err -fflags +igndts -copy_unknown -i "%%~fV" -f !ext! -c copy -map 0 -vn -sn -b:a 32k "%%~pnxV.tmpoutput"
Which works for other file types with the same type of data stream and will work with .wmv if I add -dn (even though my file is then not recognizable by the external program). The command above, as is, for .wmv files will output the error Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted.
From FFprobe (full output below), I can see the message Unsupported codec with id 0 for input stream 2, so I believe it's beyond doubt that the cause is indeed the data stream.
Question
The thing is that I expected -copy_unknown to deal with this and it doesn't. My question is: how do I copy this unsupported, not used anywhere else data stream? Are there other ways to approach the matter?
Thanks
Extra info
Full FFmpeg output (with -loglevel debug):
ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9.1.1 (GCC) 20190807
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-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Splitting the commandline.
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 'debug'.
Reading option '-flags' ... matched as AVOption 'flags' with argument 'global_header'.
Reading option '-err_detect' ...Routing option err_detect to both codec and muxer layer
matched as AVOption 'err_detect' with argument 'ignore_err'.
Reading option '-fflags' ... matched as AVOption 'fflags' with argument '+igndts'.
Reading option '-copy_unknown' ... matched as option 'copy_unknown' (Copy unknown stream types) with argument '1'.
Reading option '-i' ... matched as input url with argument 'C:\Users\Fabio\Desktop\Testes\test\a.wmv'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'asf'.
Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0'.
Reading option '-vn' ... matched as option 'vn' (disable video) with argument '1'.
Reading option '-sn' ... matched as option 'sn' (disable subtitle) with argument '1'.
Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '32k'.
Reading option '\Users\Fabio\Desktop\Testes\test\a.wmv.tmpoutput' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option loglevel (set logging level) with argument debug.
Applying option copy_unknown (Copy unknown stream types) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url C:\Users\Fabio\Desktop\Testes\test\a.wmv.
Successfully parsed a group of options.
Opening an input file: C:\Users\Fabio\Desktop\Testes\test\a.wmv.
[NULL @ 0000025955e7af40] Opening 'C:\Users\Fabio\Desktop\Testes\test\a.wmv' for reading
[file @ 0000025955e7b740] Setting default whitelist 'file,crypto'
[asf @ 0000025955e7af40] Format asf probed with size=2048 and score=100
[asf @ 0000025955e7af40] gpos mismatch our pos=24, end=244
[asf @ 0000025955e7af40] gpos mismatch our pos=24, end=26
[asf @ 0000025955e7af40] gpos mismatch our pos=24, end=3295
[asf @ 0000025955e7af40] Payload extension 50 2
[asf @ 0000025955e7af40] gpos mismatch our pos=24, end=42
[asf @ 0000025955e7af40] gpos mismatch our pos=24, end=44
[asf @ 0000025955e7af40] gpos mismatch our pos=24, end=834
[asf @ 0000025955e7af40] Before avformat_find_stream_info() pos: 5793 bytes read:32768 seeks:0 nb_streams:3
[asf @ 0000025955e7af40] parser not found for codec wmav2, packets or times may be invalid.
[wmv3 @ 0000025955eb4480] Header: 46690A01
[wmv3 @ 0000025955eb4480] Profile 1:
frmrtq_postproc=3, bitrtq_postproc=6
LoopFilter=1, MultiRes=0, FastUVMC=0, Extended MV=0
Rangered=0, VSTransform=1, Overlap=1, SyncMarker=0
DQuant=0, Quantizer mode=0, Max B-frames=0
[wmv3 @ 0000025955eb4480] Extra data: 8 bits left, value: 0
[wmv3 @ 0000025955eb4480] Format yuv420p chosen by get_format().
Last message repeated 1 times
[asf @ 0000025955e7af40] parser not found for codec wmav2, packets or times may be invalid.
[asf @ 0000025955e7af40] All info found
[asf @ 0000025955e7af40] After avformat_find_stream_info() pos: 191671 bytes read:196608 seeks:0 frames:58
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, asf, from 'C:\Users\Fabio\Desktop\Testes\test\a.wmv':
Metadata:
copyright : ChessBase GmbH
WMFSDKVersion : 12.0.9600.17415
WMFSDKNeeded : 0.0.0.0000
IsVBR : 0
DeviceConformanceTemplate: MP@ML
Duration: 00:00:23.08, start: 0.000000, bitrate: 526 kb/s
Stream #0:0, 17, 1/1000: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, stereo, fltp, 96 kb/s
Stream #0:1, 41, 1/1000: Video: wmv3 (Main), 1 reference frame (WMV3 / 0x33564D57), yuv420p(left), 640x480, 0/1, 415 kb/s, 25 tbr, 1k tbn, 1k tbc
Stream #0:2, 0, 1/1000: Data: none, 0/1, 10 kb/s
Successfully opened the file.
Parsing a group of options: output url \Users\Fabio\Desktop\Testes\test\a.wmv.tmpoutput.
Applying option f (force format) with argument asf.
Applying option c (codec name) with argument copy.
Applying option map (set input stream mapping) with argument 0.
Applying option vn (disable video) with argument 1.
Applying option sn (disable subtitle) with argument 1.
Applying option b:a (video bitrate (please use -b:v)) with argument 32k.
Successfully parsed a group of options.
Opening an output file: \Users\Fabio\Desktop\Testes\test\a.wmv.tmpoutput.
[file @ 0000025955eee200] Setting default whitelist 'file,crypto'
Successfully opened the file.
Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:2 -> #0:1 (copy)
Last message repeated 1 times
[AVIOContext @ 0000025955eee2c0] Statistics: 0 seeks, 1 writeouts
[AVIOContext @ 0000025955e83980] Statistics: 196608 bytes read, 0 seeks
FFprobe on a sample file:
ffprobe version 4.3 Copyright (c) 2007-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200621
configuration: --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-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-libopenmpt --enable-amf
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
[wmv3 @ 00000180012e1440] Extra data: 8 bits left, value: 0
Input #0, asf, from 'test/a.wmv':
Metadata:
WMFSDKVersion : 12.0.9600.17415
WMFSDKNeeded : 0.0.0.0000
IsVBR : 0
DeviceConformanceTemplate: MP@ML
Duration: 00:00:23.08, start: 0.000000, bitrate: 526 kb/s
Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, 2 channels, fltp, 96 kb/s
Stream #0:1: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 640x480, 415 kb/s, 25 tbr, 1k tbn, 1k tbc
Stream #0:2: Data: none, 10 kb/s
[wmv3 @ 0000018001324a80] Extra data: 8 bits left, value: 0
Unsupported codec with id 0 for input stream 2
Other
I chose to specify -f and .tmpoutput to facilitate other non-related parts of my flow.
