Hi everyone :) I have a situation where I would need to encode Quicktime (MOV) files with ISO639-2 language metadata values "less popular/common" than usual. I've also read the related the Quicktime Specs [1,2].
How can I set language to e.g. UND or QAA? Whenever I try to encode a file e.g. with the language tracks "UND" (=undetermined) or "QAA" (=reserved for local use), the value written to the file is "ENG". Both "und" and "qaa" are proper ISO639-2 codes [3]. In order to rule out syntax issues, I've tried with "ger" (=German) and "fra" (=French): Both work flawlessly. I've seen in "libavformat/isom.c" [4], and there's a hardcoded list of ISO639 codes, but says: /* deprecated by putting the code as 3*5 bits ASCII */ Sounded to me like this list-limitation is superseded by"ff_mov_iso639_to_lang", but how do I trigger it to be used? Grateful for any help :) Thanks in advance, Peter B. Here's commandline and complete, uncut console output to reproduce it: // ------------------------------ $ ffmpeg -y -f lavfi -i "sine=frequency=1000:duration=1" -c:a pcm_s16le -metadata:s:a:0 language=qaa delme.mov // ------------------------------ ffmpeg version N-92314-g323c2cf Copyright (c) 2000-2018 the FFmpeg developers built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609 configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-version3 --enable-postproc --enable-ffplay --enable-swscale --enable-avfilter --enable-pthreads --enable-bzlib --enable-zlib --enable-decoder=png --enable-encoder=png --samples=../fate-suite --enable-libfreetype --enable-libopenjpeg --disable-decoder=jpeg2000 --enable-libvpx --enable-libvorbis --enable-libx264 --enable-libx265 libavutil 56. 21.100 / 56. 21.100 libavcodec 58. 34.100 / 58. 34.100 libavformat 58. 19.102 / 58. 19.102 libavdevice 58. 4.106 / 58. 4.106 libavfilter 7. 39.100 / 7. 39.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0, lavfi, from 'sine=frequency=1000:duration=1': Duration: N/A, start: 0.000000, bitrate: 705 kb/s Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, mov, to 'delme.mov': Metadata: encoder : Lavf58.19.102 Stream #0:0(qaa): Audio: pcm_s16le (sowt / 0x74776F73), 44100 Hz, mono, s16, 705 kb/s Metadata: encoder : Lavc58.34.100 pcm_s16le [Parsed_sine_0 @ 0x2a09580] EOF timestamp not reliable size= 87kB time=00:00:01.00 bitrate= 711.1kbits/s speed= 304x video:0kB audio:86kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.777778% // ------------------------------ $ ffprobe-git -loglevel quiet -show_entries stream=index,codec_name,codec_type:stream_tags=language -i delme.mov // ------------------------------ [STREAM] index=0 codec_name=pcm_s16le codec_type=audio TAG:language=eng [/STREAM] // ------------------------------ $ ffmpeg-git -y -f lavfi -i "sine=frequency=1000:duration=1" -c:a pcm_s16le -metadata:s:a:0 language=ger delme.mov // ------------------------------ ffmpeg version N-92314-g323c2cf Copyright (c) 2000-2018 the FFmpeg developers built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609 configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-version3 --enable-postproc --enable-ffplay --enable-swscale --enable-avfilter --enable-pthreads --enable-bzlib --enable-zlib --enable-decoder=png --enable-encoder=png --samples=../fate-suite --enable-libfreetype --enable-libopenjpeg --disable-decoder=jpeg2000 --enable-libvpx --enable-libvorbis --enable-libx264 --enable-libx265 libavutil 56. 21.100 / 56. 21.100 libavcodec 58. 34.100 / 58. 34.100 libavformat 58. 19.102 / 58. 19.102 libavdevice 58. 4.106 / 58. 4.106 libavfilter 7. 39.100 / 7. 39.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0, lavfi, from 'sine=frequency=1000:duration=1': Duration: N/A, start: 0.000000, bitrate: 705 kb/s Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, mov, to 'delme.mov': Metadata: encoder : Lavf58.19.102 Stream #0:0(ger): Audio: pcm_s16le (sowt / 0x74776F73), 44100 Hz, mono, s16, 705 kb/s Metadata: encoder : Lavc58.34.100 pcm_s16le [Parsed_sine_0 @ 0x2998580] EOF timestamp not reliable size= 87kB time=00:00:01.00 bitrate= 711.1kbits/s speed= 357x video:0kB audio:86kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.777778% // ------------------------------ $ ffprobe -loglevel quiet -show_entries stream=index,codec_name,codec_type:stream_tags=language -i delme.mov // ------------------------------ [STREAM] index=0 codec_name=pcm_s16le codec_type=audio TAG:language=ger [/STREAM] == References: [1] https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html [2] https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap4/qtff4.html#//apple_ref/doc/uid/TP40000939-CH206-35103 [3] https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes [4] https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/isom.c _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
