Hi,
I have an m2ts container with a H.246 video stream (interlaced 1080/50i fields, 25 full fps) and a AC3 audio stream. This was originally recorded on a Panasonic HD camcorder, and the edited in Sony Vegas, and encoded on output using Sony AVC codec. I simply want to repackage this to mp4 leading video unchanged and transcoding audio to AAC. This is the command I'm using: ffmpeg -i input.m2ts -c:v copy -c:a aac output.mp4 This works and produces a video which plays OK but there are some very odd things with the frame rate, and other aspects that make it very hard to believe the video has just been copied into the new container unchanged. . MediaInfo (and ffprobe) both report the output has a frame rate of 50fps (they also report the input has 25fps) . In an NLE (Sony Vegas) the output shows double the number of frames (at same point in movie the frame number is double). Stepping through frame by frame I can see these extra frames in the timeline of the output compared to the input file. . Media info reports differing size between input and output video stream and a different bit rate (and so does ffprobe)! Input: 661MiB & 14.8Mbs; Output: 705MiB & 15.8Mbps. Both report same length 6m15s. . 661Mib/6m15s = 14.8Mbps & 705Mib/6m15s = 15.8Mbps - so both are "self-consistent" set of data - but why different between input and output file? . The input file is 768MB and the output is 728MB, but the (re-encoded) audio stream only differs by ~3MB (according to MediaInfo) Despite this the movie plays at correct rate! I'm sure it's not re-encoding the video as its quick (e.g. video stream is processed at roughly 15x realtime), but it is doing something odd to change frame rate, and size bit/rates as well. Please can anyone explain what is going on - and how I can get ffmpeg to make a truly unchanged copy of my video stream from the m2ts into the mp4 container? Console output below, followed by ffprobe of input and output, and following this MediaInfo properties of input and output Thanks for any help! ============================================================================ ================= ffmpeg -i input.m2ts -c:v copy -c:a aac output.mp4 ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --ena ble-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca - -enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-am rnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enab le-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis - -enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lib zimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 Input #0, mpegts, from 'input.m2ts': Duration: 00:06:15.30, start: 0.941611, bitrate: 16767 kb/s Program 1 Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 9 0k tbn, 50 tbc Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s Output #0, mp4, to 'output.mp4': Metadata: encoder : Lavf57.56.100 Stream #0:0: Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 50 t br, 90k tbn, 90k tbc Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc57.64.101 aac Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (ac3 (native) -> aac (native)) Press [q] to stop, [?] for help frame=18764 fps=501 q=-1.0 Lsize= 728688kB time=00:06:15.27 bitrate=15906.8kbits/s speed= 10x video:722507kB audio:5917kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.036225% [aac @ 000000000050cf20] Qavg: 787.823 ============================================================================ ================= ffprobe input.m2ts ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --ena ble-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca - -enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-am rnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enab le-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis - -enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lib zimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 Input #0, mpegts, from 'input.m2ts': Duration: 00:06:15.30, start: 0.941611, bitrate: 16767 kb/s Program 1 Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 9 0k tbn, 50 tbc Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s ============================================================================ ================= ffprobe output.mp4 ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers built with gcc 5.4.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --ena ble-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca - -enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-am rnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enab le-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis - -enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lib zimg --enable-lzma --enable-decklink --enable-zlib libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf57.56.100 Duration: 00:06:15.29, start: 0.000000, bitrate: 15906 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 15769 kb/s, 50 fps, 50 tbr, 90k tbn, 50 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default) Metadata: handler_name : SoundHandler ============================================================================ ================= MEDIA INFO - INPUT FILE =================== General ID : 0 (0x0) Complete name : C:\Users\Video\Skiing\input.m2ts Format : BDAV Format/Info : Blu-ray Video File size : 750 MiB Duration : 6 min 43 s Overall bit rate mode : Variable Overall bit rate : 15.6 Mb/s Maximum Overall bit rate : 18.0 Mb/s Video ID : 4113 (0x1011) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4 Format settings, CABAC : Yes Format settings, ReFrames : 2 frames Format settings, GOP : M=2, N=14 Codec ID : 27 Duration : 6 min 15 s Bit rate mode : Variable Bit rate : 14.8 Mb/s Maximum bit rate : 16.0 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate : 25.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan type, store method : Separated fields Scan order : Top Field First Bits/(Pixel*Frame) : 0.285 Stream size : 661 MiB (88%) Audio ID : 4352 (0x1100) Menu ID : 1 (0x1) Format : AC-3 Format/Info : Audio Coding 3 Mode extension : CM (complete main) Format settings, Endianness : Big Codec ID : 129 Duration : 6 min 15 s Bit rate mode : Constant Bit rate : 192 kb/s Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 spf) Bit depth : 16 bits Compression mode : Lossy Delay relative to video : -40 ms Stream size : 8.59 MiB (1%) ============================================================================ ================= MEDIA INFO - OUTOUT FILE ===================== General Complete name : C:\Users\Video\Skiing\output.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 712 MiB Duration : 6 min 15 s Overall bit rate mode : Variable Overall bit rate : 15.9 Mb/s Writing application : Lavf57.56.100 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4 Format settings, CABAC : Yes Format settings, ReFrames : 2 frames Format settings, GOP : M=2, N=14 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 6 min 15 s Bit rate mode : Variable Bit rate : 15.8 Mb/s Maximum bit rate : 16.0 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 50.000 FPS Original frame rate : 25.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan type, store method : Separated fields Scan order : Top Field First Bits/(Pixel*Frame) : 0.152 Stream size : 705 MiB (99%) Audio ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : 40 Duration : 6 min 15 s Duration_LastFrame : -11 ms Bit rate mode : Constant Bit rate : 129 kb/s Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 spf) Compression mode : Lossy Stream size : 5.78 MiB (1%) Default : Yes Alternate group : 1 _______________________________________________ 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".