#678: Warn that filtering is disabled when copying streams -------------------------------------+------------------------------------- Reporter: llogan | Owner: Type: | Status: new enhancement | Component: Priority: wish | undetermined Version: git- | Keywords: master | Blocking: Blocked By: | Analyzed by developer: 0 Reproduced by developer: 0 | -------------------------------------+------------------------------------- Some users assume they can copy a video steam and perform filtering [1]. FFmpeg does not give any feedback that the filter is being ignored. Current behavior: {{{ $ ffmpeg -i hop.mp4 -c copy -vf crop=iw:ih-20 -y out.mpg ffmpeg version N-35078-g7831788, Copyright (c) 2000-2011 the FFmpeg developers built on Nov 22 2011 10:36:32 with gcc 4.6.2 configuration: --prefix=/usr --enable-gpl libavutil 51. 26. 0 / 51. 26. 0 libavcodec 53. 36. 0 / 53. 36. 0 libavformat 53. 21. 0 / 53. 21. 0 libavdevice 53. 4. 0 / 53. 4. 0 libavfilter 2. 49. 0 / 2. 49. 0 libswscale 2. 1. 0 / 2. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hop.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 1970-01-01 00:00:00 encoder : Lavf52.32.0 Duration: 00:00:10.13, start: 0.000000, bitrate: 563 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480, 559 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc Metadata: creation_time : 1970-01-01 00:00:00 handler_name : [mpeg @ 0x1d17860] VBV buffer size not set, muxing may fail Output #0, mpeg, to 'out.mpg': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 1970-01-01 00:00:00 encoder : Lavf53.21.0 Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 640x480, q=2-31, 559 kb/s, 30 fps, 90k tbn, 30 tbc Metadata: creation_time : 1970-01-01 00:00:00 handler_name : Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help frame= 304 fps= 0 q=-1.0 Lsize= 700kB time=00:00:10.06 bitrate= 569.6kbits/s video:692kB audio:0kB global headers:0kB muxing overhead 1.166920% }}} Example warning: "Filtering is disabled when copying streams." Of course the message could be more specific as to what streams are affected and what filters are actually disabled. [1] http://ffmpeg.org/pipermail/ffmpeg-user/2011-November/003175.html -- Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/678> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker