Created
January 5, 2012 19:58
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| Hi, | |
| I am trying to encode some videos that were recorded with different iPhones into MP4 formats to make them playable on mobile web browsers like iPhone 3GS, iPhone 4 and Android. | |
| Based on our testing, we found out that the videos Transloadit encodes are using the High video profile which makes them unplayable on the iPhone 3GS mobile web browser. | |
| I have tried several things to lower the profile to Normal but I unfortunately couldn't get it to work. Some things I tried: | |
| Based on: | |
| http://avp.stackexchange.com/questions/2634/how-do-i-specify-baseline-h264-profile-using-ffmbc | |
| I tried putting an vprofile baseline argument in the ffmpeg settings but it resulted in an error: | |
| https://transloadit.com/assemblies/view/2cc8df28902a851d8e67f8df74ca0751 | |
| Also based on: | |
| http://wiki.maemo.org/Manual_video_encoding | |
| I tried putting a coder=0 in the ffmpeg settings in the iphone-high preset but again, it didn't seem to help. | |
| So my question is how can I use baseline profile encoding for my videos so that they play fine on iPhone 3GS Safari? | |
| Note: | |
| You can see some of the mediainfo outputs in this gist: | |
| https://gist.github.com/1566942 |
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| Install mediainfo using `brew install mediainfo`. | |
| youtube.txt is the one that iPHone 3GS can play. | |
| transloadit.txt is the one generated using iphone-high preset on Transloadit. |
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| General | |
| Complete name : test.mp4 | |
| Format : MPEG-4 | |
| Format profile : Base Media | |
| Codec ID : isom | |
| File size : 2.46 MiB | |
| Duration : 26s 539ms | |
| Overall bit rate mode : Variable | |
| Overall bit rate : 777 Kbps | |
| Recorded date : 2011-12-18T13:32:23-0800 | |
| Writing application : Lavf52.99.1 | |
| Video | |
| ID : 1 | |
| Format : AVC | |
| Format/Info : Advanced Video Codec | |
| Format profile : High@L3.0 | |
| Format settings, CABAC : Yes | |
| Format settings, ReFrames : 4 frames | |
| Codec ID : avc1 | |
| Codec ID/Info : Advanced Video Coding | |
| Duration : 26s 520ms | |
| Bit rate : 700 Kbps | |
| Width : 1 280 pixels | |
| Height : 720 pixels | |
| Display aspect ratio : 16:9 | |
| Frame rate mode : Constant | |
| Frame rate : 25.000 fps | |
| Color space : YUV | |
| Chroma subsampling : 4:2:0 | |
| Bit depth : 8 bits | |
| Scan type : Progressive | |
| Bits/(Pixel*Frame) : 0.030 | |
| Stream size : 2.18 MiB (89%) | |
| Writing library : x264 core 114 r1913 5fd3dce | |
| Encoding settings : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=4 / psy=1 / psy_rd=0.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=20 / rc=cbr / mbtree=1 / bitrate=700 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=700 / vbv_bufsize=700 / nal_hrd=none / ip_ratio=1.41 / aq=1:1.00 | |
| Audio | |
| ID : 2 | |
| Format : AAC | |
| Format/Info : Advanced Audio Codec | |
| Format profile : LC | |
| Codec ID : 40 | |
| Duration : 26s 539ms | |
| Bit rate mode : Variable | |
| Bit rate : 82.8 Kbps | |
| Channel(s) : 1 channel | |
| Channel positions : Front: C | |
| Sampling rate : 48.0 KHz | |
| Compression mode : Lossy | |
| Stream size : 268 KiB (11%) | |
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| General | |
| Complete name : youtube.mp4 | |
| Format : MPEG-4 | |
| Format profile : Base Media / Version 2 | |
| Codec ID : mp42 | |
| File size : 8.00 MiB | |
| Duration : 2mn 3s | |
| Overall bit rate mode : Variable | |
| Overall bit rate : 543 Kbps | |
| Encoded date : UTC 2012-01-02 21:51:41 | |
| Tagged date : UTC 2012-01-02 21:51:41 | |
| gsst : 0 | |
| gstd : 123645 | |
| gssd : BCEA991CAHH1325730935739848 | |
| gshh : o-o.preferred.twtelecom-oak1.v23.lscache3.c.youtube.com | |
| Video | |
| ID : 1 | |
| Format : AVC | |
| Format/Info : Advanced Video Codec | |
| Format profile : Baseline@L3.0 | |
| Format settings, CABAC : No | |
| Format settings, ReFrames : 1 frame | |
| Codec ID : avc1 | |
| Codec ID/Info : Advanced Video Coding | |
| Duration : 2mn 3s | |
| Bit rate : 446 Kbps | |
| Maximum bit rate : 2 509 Kbps | |
| Width : 640 pixels | |
| Height : 360 pixels | |
| Display aspect ratio : 16:9 | |
| Frame rate mode : Constant | |
| Frame rate : 23.976 fps | |
| Color space : YUV | |
| Chroma subsampling : 4:2:0 | |
| Bit depth : 8 bits | |
| Scan type : Progressive | |
| Bits/(Pixel*Frame) : 0.081 | |
| Stream size : 6.57 MiB (82%) | |
| Tagged date : UTC 2012-01-02 21:51:41 | |
| Audio | |
| ID : 2 | |
| Format : AAC | |
| Format/Info : Advanced Audio Codec | |
| Format profile : LC | |
| Codec ID : 40 | |
| Duration : 2mn 3s | |
| Bit rate mode : Variable | |
| Bit rate : 96.0 Kbps | |
| Maximum bit rate : 141 Kbps | |
| Channel(s) : 2 channels | |
| Channel positions : Front: L R | |
| Sampling rate : 44.1 KHz | |
| Compression mode : Lossy | |
| Stream size : 1.39 MiB (17%) | |
| Title : IsoMedia File Produced by Google, 5-11-2011 | |
| Encoded date : UTC 2012-01-02 21:51:41 | |
| Tagged date : UTC 2012-01-02 21:51:41 |
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