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  1. I want to make all my movies on an external drive playable on the Roku 3. The complication is that most of the files contain a variable number of audio tracks (main, director's commentary, perhaps a second language track, etc), and +/- subtitle tracks.

    I've selected all the .mkv and .m4v files with AC3-only audio, extracted the first audio track, and created the AAC equivalent. To add the new AAC audio track to the .mkv files I use "mkvmerge -o new-movie.mkv movie.mkv movie.aac". How do I accomplish this with ffmpeg (or other program with a CLI) for the .m4v files and not clobber any of the existing tracks? My usual OS is Linux, however Windows 7 is available as well.

    Thank you in advance.
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  2. I found the initial answer to my question with the command

    Code:
    ffmpeg -i movie.m4v -i movie.aac -c copy -map 0 -map 1 new-movie.m4v
    where movie.aac was generated with the commands

    Code:
    ffmpeg -i movie.m4v -map 0:a:0 -vn -acodec copy movie.ac3
    ffmpeg -i movie.ac3 -acodec libfaac movie.aac
    The result of the first command is

    Code:
        [...]
        Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 718x480 [SAR 8:9 DAR 359:270], q=2-31, 1340 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 90k tbc (default)
        Metadata:
          creation_time   : 2014-05-14 14:08:36
          encoder         : JVT/AVC Coding
        Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), 384 kb/s (default)
        Metadata:
          creation_time   : 2014-05-14 14:08:36
        Side data:
          unknown side data type 7 (4 bytes)
        Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
        Metadata:
          creation_time   : 2014-05-14 14:08:36
        Stream #0:3: Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, 195 kb/s
    Stream mapping:
      Stream #0:0 -> #0:0 (copy)
      Stream #0:1 -> #0:1 (copy)
      Stream #0:2 -> #0:2 (copy)
      Stream #1:0 -> #0:3 (copy)
    Press [q] to stop, [?] for help
    [ipod @ 0x1bd29e0] Malformed AAC bitstream detected: use the audio bitstream filter 'aac_adtstoasc' to fix it ('-bsf:a aac_adtstoasc' option with ffmpeg)
    av_interleaved_write_frame(): Operation not permitted
    frame= 1961 fps=0.0 q=-1.0 Lsize=   15962kB time=00:01:21.88 bitrate=1596.8kbits/s    
    video:12060kB audio:3839kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.395979%
    Conversion failed!
    Adding '-bsf:a aac_adtstoasc'

    Code:
    ffmpeg -i movie.m4v -i movie.aac -c copy -bsf:a aac_adtstoasc -map 0 -map 1 new-movie.m4v
    doesn't exactly help:

    Code:
    [...]
    Stream mapping:
      Stream #0:0 -> #0:0 (copy)
      Stream #0:1 -> #0:1 (copy)
      Stream #0:2 -> #0:2 (copy)
      Stream #1:0 -> #0:3 (copy)
    Press [q] to stop, [?] for help
    [NULL @ 0x2732500] Error parsing ADTS frame header!
    Failed to open bitstream filter aac_adtstoasc for stream 0 with codec copy: Invalid data found when processing input
    [NULL @ 0x2732500] Error parsing ADTS frame header!
    Failed to open bitstream filter aac_adtstoasc for stream 0 with codec copy: Invalid data found when processing input
    [NULL @ 0x2732500] Error parsing ADTS frame header!
    Failed to open bitstream filter aac_adtstoasc for stream 0 with codec copy: Invalid data found when processing input
    [...]
    There's not much help via Google in resolving these errors. Anyone have an alternate approach?

    Thanks.
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  3. Found the solution, use a mp4 container for the AAC file. This assumes the AC3 track is the first audio track.

    Code:
    ffmpeg -i movie.m4v -map 0:a:0 -vn -acodec libfaac movie.mp4
    ffmpeg -i movie.m4v -i movie.mp4 -c copy -map 0 -map 1 new-movie.m4v
    Hopefully this thread will prove useful to someone else.
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  4. I'm a MEGA Super Moderator Baldrick's Avatar
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    Thanks for posting the solution!
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  5. Member
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    Australia
    Search Comp PM
    mp4box -add movie.m4v -add "movie.aac:lang=en:group=1:name=AAC Audio" movie-new.m4v
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  6. Here's the Readme file I created to help me the next time I have to do this and the painfully gathered knowledge has evaporated. It's not meant to be used in a "fire and forget" mode. I cut and paste the shell fragments, run each individually, verify the results, then go on to the next step.

    Cheers!

    Paul Pomes, DVM
    http://www.FurryFriendsVet.com

    Code:
    # AAC-from-AC3
    #
    # My Roku 3 does not support the AC-3 audio codec. To make all my movies
    # playable I've created this set of scripts to extract the AC-3 track from
    # movies that lack an AAC track, convert that to AAC, and layer it back into
    # the MKV or M4V container as an additional track while preserving all
    # existing tracks.
    
    # This collection of scripts generates action scripts. I'm cautious about
    # overly-automating conversions since a mistake could trash a lot of effort.
    # Backups are an excellent idea, however mine are currently on CONUS while
    # I'm working on Guam with a USB drive copy. Once the action scripts are
    # created, I test them on a single movie to make sure the results are what
    # I intend before letting it go full-auto on the rest.
    #
    # Paul Pomes, DVM
    # paul@pomes.org
    # www.FurryFriendsVet.com
    
    # Identify which files lack an AAC track
    
    rm -i mkv-files m4v-files
    
    for i in *mkv
    do
    	mediainfo "$i" | grep -q AAC
    	if [ $? -ne 0 ] ; then echo $i >> mkv-files ; fi
    done
    
    for i in *m4v
    do
    	mediainfo "$i" | grep -q AAC
    	if [ $? -ne 0 ] ; then echo $i >> m4v-files ; fi
    done
    
    # Identify which audio track is the main AC-3 track. Almost always this will be
    # track 1. Exceptions - say it's track 3 - can be handled by hand edits of
    # the extraction scripts. For MKV files change "1:[...]" to "3:[...]"
    # (see examples below). For M4V change "-map 0:a:0" to "-map 0:a:2".
    
    # Create extraction and conversion scripts. First is for MKV containers,
    # the second for M4V. AC-3 to AAC is the slowest part of this whole process
    # which for 40 movies took overnight.
    
    while read i
    do
    	j=`basename -s .mkv "$i"`
    	echo -n "mkvextract tracks \"$i\" "
    	mkvmerge -i "$i" | grep AC3 | head -1 | sed -e "s/.*\(.\):.*/\1:\"$j.ac3\" ; \\\\ /"
    	echo "ffmpeg -i \"$j.ac3\" -acodec libfaac \"$j.aac\""
    done < mkv-files
    
    while read i
    do
    	j=`basename -s .m4v "$i"`
    	echo -n "ffmpeg -i \"$i\" -map 0:a:"
    	echo -n $((`mkvmerge -i "$i" | grep AC3 | head -1 | sed -e "s/.*\(.\):.*/\1/"` - 1))
    	echo " -vn -acodec libfaac \"$j.mp4\""
    done < m4v-files
    
    # Mux the new AAC files into the original containers
    while read i
    do
    	j=`basename -s .mkv "$i"`
    	k="$j-new.mkv"
    	echo "mkvmerge -o \"$k\" \"$i\" \"$j.aac\""
    	echo "ls -lh \"$k\" \"$i\""
    	echo "mkvmerge -i \"$i\""
    	echo "mkvmerge -i \"$k\""
    	echo "mv -i \"$k\" \"$i\""
    done < mkv-files
    
    while read i
    do
    	j=`basename -s .m4v "$i"`
    	k="$j-new.m4v"
    	echo "ffmpeg -i \"$i\" -i \"$j.mp4\" -c copy -map 0 -map 1 \"$k\""
    	echo "ls -lh \"$k\" \"$i\""
    	echo "mkvmerge -i \"$i\""
    	echo "mkvmerge -i \"$k\""
    	echo "mv -i \"$k\" \"$i\""
    done < m4v-files
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