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  • How do I skip audio 1 and transcode audio 2 to aac with ffmpg ? [closed]

    25 septembre 2024, par CA Opa

    I have videos with 2 audio tracks. Track 1 is ac3 foreign and track 2 is flac English. I only want to transcode the English track 2. When I use ffmpg to map track 2 and transcode to aac the result is vorbis.

    


    Here is my code :

    


    "ffmpeg.exe" -i "U:\infile.mkv" -map 0:v:0 -c:v:0 copy -map 0:a:1 -c:a:1 aac -ac:a:1 2 -b:a:1 192000 -map 0:s:0 -c:s copy "U:\Outfile.mkv"


    


    This is what happens :

    


      Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709/unknown/unknown, progressive), 1278x720 [SAR 1:1 DAR 71:40], 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(rus): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
      Metadata:
        title           : Многоголосый закадровый, студия "Селена Интернешнл"
  Stream #0:2(eng): Audio: flac, 48000 Hz, stereo, s16
  Stream #0:3(eng): Subtitle: subrip (srt)
[out#0/matroska @ 000001b979895440] Codec AVOption b:a:1 (set bitrate (in bits/s)) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (flac (native) -> vorbis (libvorbis))
  Stream #0:3 -> #0:2 (copy)
Press [q] to stop, [?] for help
Output #0, matroska, to 'U:\Outfile.mkv':
  Metadata:
    encoder         : Lavf61.5.101
  Chapters:
    Chapter #0:0: start 0.000000, end 180.000000
      Metadata:
        title           : On a Cold Night...
  Stream #0:0(eng): Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709/unknown/unknown, progressive), 1278x720 [SAR 1:1 DAR 71:40], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(eng): Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, fltp
      Metadata:
        encoder         : Lavc61.11.100 libvorbis
  Stream #0:2(eng): Subtitle: subrip
[out#0/matroska @ 000001b979895440] video:174005KiB audio:1635KiB subtitle:1KiB other streams:0KiB global headers:4KiB muxing overhead: 0.059971%


    


    If I transcode both audio tracks it succeeds.

    


    "ffmpeg.exe" -i "infile.mkv" -map 0:v:0 -c:v:0 copy -map 0:a:0 -c:a:0 aac -ac:a:0 2 -b:a:0 192000 -map 0:a:1 -c:a:1 aac -ac:a:1 2 -b:a:1 192000 -map 0:s:0 -c:s copy "Outfile.mkv"


    


    If I just transcoding track 1 it works. Why does it fail when I only map audio track 2 ?

    


  • How to create a DASH VOD for Chromecast with ffmpeg ?

    19 novembre 2020, par Oleg Yablokov

    I need to serve long videos ( 2 hours) from a web server to mobile clients and the clients should be able to play the videos via Chromecast. I have chosen mpeg-dash for this purpose : video encoder is h.264 (level 4.1), audio is aac (although I've tried diffrent ones).

    


    I've tried ffmpeg, MP4Box and some other tools to generate videos ; most of the time I succeeded playing them on VLC or on a mobile client (locally), but not with Chromecast.

    


    I've tried Amazon's Elastic Transcoder and it worked, but it gave me one big file whereas I need many small segments.

    


    CORS are set.

    


    Chromecast remote debugging didn't help much.

    


    Do you know how to do this ?

    


  • ffmpeg.c what are pts and dts ? what does this code block do in ffmpeg.c ?

    19 février 2014, par Aditya P
    • In simple terms what are pts and dts values ?
    • Why are they important while transcoding [decode-encode] videos ?

    What does this code bit do in ffmpeg.c , what is its purpose ?

    01562    ist->next_pts = ist->pts = picture.best_effort_timestamp;
    
01563    if (ist->st->codec->time_base.num != 0) {
    
01564        int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
    
01565        ist->next_pts += ((int64_t)AV_TIME_BASE *
    
01566                         ist->st->codec->time_base.num * ticks) /
    
01567                         ist->st->codec->time_base.den;
    
01568    }

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