Opened 7 years ago
Last modified 7 years ago
#6890 new defect
Misleading log message for -b:a option
Reported by: | Tristan Matthews | Owned by: | |
---|---|---|---|
Priority: | minor | Component: | ffmpeg |
Version: | git-master | Keywords: | |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
When using the -b:a option, ffmpeg logs report "Applying option b:a (video bitrate (please use -b:v)) with argument 160k."
It seems like this option is not actually interpreted as the video bitrate, but the message is misleading.
Using the deprecated -ab option yields an expected message, "Applying option ab (audio bitrate (please use -b:a)) with argument 160k."
How to reproduce:
% ffmpeg -y -loglevel trace -f lavfi -t 1 -i anullsrc -c:a libopus -b:a 160k -c copy -f nut /dev/null ffmpeg version N-89369-g5a93a85fd0 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7 (Debian 7.2.0-16) configuration: --enable-gpl --enable-libopus -=enable-debug=gdb libavutil 56. 4.100 / 56. 4.100 libavcodec 58. 6.102 / 58. 6.102 libavformat 58. 2.103 / 58. 2.103 libavdevice 58. 0.100 / 58. 0.100 libavfilter 7. 6.100 / 7. 6.100 libswscale 5. 0.101 / 5. 0.101 libswresample 3. 0.101 / 3. 0.101 libpostproc 55. 0.100 / 55. 0.100 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 'trace'. Reading option '-f' ... matched as option 'f' (force format) with argument 'lavfi'. Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '1'. Reading option '-i' ... matched as input url with argument 'anullsrc'. Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'libopus'. Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '160k'. Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'. Reading option '-f' ... matched as option 'f' (force format) with argument 'nut'. Reading option '/dev/null' ... 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 trace. Successfully parsed a group of options. Parsing a group of options: input url anullsrc. Applying option f (force format) with argument lavfi. Applying option t (record or transcode "duration" seconds of audio/video) with argument 1. Successfully parsed a group of options. Opening an input file: anullsrc. detected 8 logical cores [AVFilterGraph @ 0x55b9e6bc7ee0] query_formats: 2 queried, 3 merged, 0 already done, 0 delayed [Parsed_anullsrc_0 @ 0x55b9e6bc9260] sample_rate:44100 channel_layout:'stereo' nb_samples:1024 [lavfi @ 0x55b9e6bc71c0] All info found [lavfi @ 0x55b9e6bc71c0] stream 0: start_time: 0.000 duration: -209146758205323.719 [lavfi @ 0x55b9e6bc71c0] format: start_time: 0.000 duration: -9223372036854.775 bitrate=705 kb/s Input #0, lavfi, from 'anullsrc': Duration: N/A, start: 0.000000, bitrate: 705 kb/s Stream #0:0, 1, 1/44100: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s Successfully opened the file. Parsing a group of options: output url /dev/null. Applying option c:a (codec name) with argument libopus. Applying option b:a (video bitrate (please use -b:v)) with argument 160k. Applying option c (codec name) with argument copy. Applying option f (force format) with argument nut. Successfully parsed a group of options. Opening an output file: /dev/null. [file @ 0x55cd85c1a680] Setting default whitelist 'file,crypto' Successfully opened the file. Output #0, nut, to '/dev/null': Metadata: encoder : Lavf58.2.103 Stream #0:0, 0, 1/44100: Audio: pcm_u8 (PUD[8] / 0x8445550), 44100 Hz, stereo, u8, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help cur_dts is invalid (this is harmless if it occurs once at the start per stream) No more output streams to write to, finishing. size= 88kB time=00:00:00.99 bitrate= 725.9kbits/s speed=1.46e+03x video:0kB audio:88kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.543768% Input file #0 (anullsrc): Input stream #0:0 (audio): 45 packets read (92160 bytes); Total: 45 packets (92160 bytes) demuxed Output file #0 (/dev/null): Output stream #0:0 (audio): 44 packets muxed (90112 bytes); Total: 44 packets (90112 bytes) muxed 0 frames successfully decoded, 0 decoding errors [AVIOContext @ 0x55cd85c1a800] Statistics: 0 seeks, 2 writeouts
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